feat: Add release workflow

.github/workflows/create-release.yaml

@@ -0,0 +1,99 @@
+name: "Create release"
+
+env:
+  IMAGE_REPO: europe-docker.pkg.dev/kyma-project/prod/runtime-watcher-skr
+  CODE_REPOSITORY: kyma-project/runtime-watcher
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]-?*'
+jobs:
+  validate-release:
+    name: Validate release
+    runs-on: ubuntu-latest
+    outputs:
+      current_release_tag: ${{ steps.get_current_release_tag.outputs.current_release_tag }}
+      last_release_tag: ${{ steps.get_last_release_tag.outputs.last_release_tag }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Find the release tag
+        id: get_current_release_tag
+        run: |
+          echo "Current release tag: ${GITHUB_REF#refs/*/}"
+          echo "current_release_tag=${GITHUB_REF#refs/*/}" >> $GITHUB_OUTPUT
+      - name: Check if release doesn't exist yet
+        env:
+          CURRENT_RELEASE_TAG: ${{ steps.get_current_release_tag.outputs.current_release_tag }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: ./runtime-watcher/scripts/release/get_release_by_tag.sh $CURRENT_RELEASE_TAG
+      - name: Get last release version
+        id: get_last_release_tag
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          set +e
+          SCRIPT_OUTPUT=$(./runtime-watcher/scripts/release/get_last_release.sh)
+          SCRIPT_EXIT_CODE=$?
+          if [[ $SCRIPT_EXIT_CODE != 0 ]]; then
+            echo "$SCRIPT_OUTPUT"
+            exit $SCRIPT_EXIT_CODE
+          fi
+          set -e
+          echo "Last Release version: $SCRIPT_OUTPUT"
+          echo "last_release_tag=$SCRIPT_OUTPUT" >> $GITHUB_OUTPUT
+      - name: Wait for the Docker image
+        timeout-minutes: 15
+        env:
+          ITERATIONS: 30
+          SLEEP_SECONDS: 30
+        run: ./runtime-watcher/scripts/release/wait_for_image.sh ${{ env.IMAGE_REPO }}:${{ steps.get_current_release_tag.outputs.current_release_tag }} $ITERATIONS $SLEEP_SECONDS
+  draft-release:
+    name: Create draft release
+    runs-on: ubuntu-latest
+    needs: validate-release
+    outputs:
+      release_id: ${{ steps.draft_release.outputs.release_id }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Generate changelog
+        id: generate_changelog
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CURRENT_RELEASE_TAG: ${{ needs.validate-release.outputs.current_release_tag }}
+          LAST_RELEASE_TAG: ${{ needs.validate-release.outputs.last_release_tag }}
+        run: |
+          echo "Generating changelog for version: ${{ needs.validate-release.outputs.current_release_tag }}" 
+          CHANGELOG_FILE_NAME=$(./runtime-watcher/scripts/release/create_changelog.sh $CURRENT_RELEASE_TAG $LAST_RELEASE_TAG)
+          echo "changelog_file_name=$CHANGELOG_FILE_NAME" >> $GITHUB_OUTPUT
+      - name: Create draft release
+        id: draft_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CURRENT_RELEASE_TAG: ${{ needs.validate-release.outputs.current_release_tag }}
+          CHANGELOG_FILE_NAME: ${{ steps.generate_changelog.outputs.changelog_file_name }}
+        run: |
+          RELEASE_ID=$(./runtime-watcher/scripts/release/create_draft_release.sh $CURRENT_RELEASE_TAG $CHANGELOG_FILE_NAME)
+          echo "RELEASE_ID=$RELEASE_ID"
+          echo "release_id=$RELEASE_ID" >> $GITHUB_OUTPUT
+  publish_release:
+    name: Publish release
+    runs-on: ubuntu-latest
+    needs: draft-release
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Publish release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          RELEASE_ID: ${{ needs.draft-release.outputs.release_id }}
+        run: |
+          echo "RELEASE_ID=$RELEASE_ID"
+          ./runtime-watcher/scripts/release/publish_release.sh $RELEASE_ID

README.md

@@ -26,4 +26,5 @@ The [Listener package](https://github.com/kyma-project/runtime-watcher/tree/main
 
 ## Read more
 
+The release process is described in the [How To Release](./docs/how_to_release.md) document.
 For further details on Runtime Watcher's architecture, see the [Architecture](./docs/architecture.md) document.

docs/how_to_release.md

@@ -0,0 +1,15 @@
+# Runtime Watcher Release Procedure
+
+Use the steps described in this document to release a new version of Runtime Watcher.
+
+## Steps
+
+1. Checkout the main branch.
+2. Create a new tag for the release in the main branch and push it to the repository. The tag should follow the [Semantic Versioning 2.0.0 format](https://semver.org/), for example, `1.2.3`.
+   The new tag will trigger a ProwJob that creates and publishes a Docker image with a Runtime Watcher executable.
+   The new tag will also trigger the release workflow.
+
+> **NOTE:** The release workflow waits for a Docker image to be published. If the image is not available within the configured time (15 minutes), the workflow fails. In that case, you need to manually re-run it once the Docker image is ready. The expected image URL is: `europe-docker.pkg.dev/kyma-project/prod/runtime-watcher-skr:<NewTag>`
+
+> **NOTE:** If you want to create a tag without triggering a release, just ensure the tag does not match the Semantic Versioning format.
+

runtime-watcher/scripts/release/create_changelog.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o errexit
+set -E
+set -o pipefail
+
+CURRENT_RELEASE_TAG=$1
+LAST_RELEASE_TAG=$2
+
+GITHUB_URL=https://api.github.com/repos/${CODE_REPOSITORY}
+GITHUB_AUTH_HEADER="Authorization: token ${GITHUB_TOKEN}"
+CHANGELOG_FILE="CHANGELOG.md"
+
+echo "## What has changed" >> ${CHANGELOG_FILE}
+
+git log ${LAST_RELEASE_TAG}..${CURRENT_RELEASE_TAG} --pretty=tformat:"%h" --reverse | while read -r commit
+do
+    COMMIT_AUTHOR=$(curl -H "${GITHUB_AUTH_HEADER}" -sS "${GITHUB_URL}/commits/${commit}" | jq -r '.author.login')
+    git show -s ${commit} --format="* %s by @${COMMIT_AUTHOR}" >> ${CHANGELOG_FILE}
+done
+
+echo -e "\n**Full changelog**: $GITHUB_URL/compare/${LAST_RELEASE_TAG}...${CURRENT_RELEASE_TAG}" >> ${CHANGELOG_FILE}
+
+echo ${CHANGELOG_FILE}

runtime-watcher/scripts/release/create_draft_release.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o errexit
+set -E
+set -o pipefail
+
+RELEASE_TAG=$1
+CHANGELOG_FILE_NAME=$2
+CHANGELOG_FILE=$(cat ${CHANGELOG_FILE_NAME})
+
+GITHUB_URL=https://api.github.com/repos/${CODE_REPOSITORY}
+GITHUB_AUTH_HEADER="Authorization: Bearer ${GITHUB_TOKEN}"
+
+#echo "RELEASE_TAG: ${RELEASE_TAG}"
+#echo "CHANGELOG_FILE_NAME: ${CHANGELOG_FILE_NAME}"
+
+JSON_PAYLOAD=$(jq -n \
+  --arg tag_name "$RELEASE_TAG" \
+  --arg name "$RELEASE_TAG" \
+  --arg body "$CHANGELOG_FILE" \
+  '{
+    "tag_name": $tag_name,
+    "name": $name,
+    "body": $body,
+    "draft": true
+  }')
+
+CURL_RESPONSE=$(curl -L \
+  -s \
+  --fail-with-body \
+  -X POST \
+  -H "Accept: application/vnd.github+json" \
+  -H "${GITHUB_AUTH_HEADER}" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  "${GITHUB_URL}"/releases \
+  -d "$JSON_PAYLOAD")
+
+# return the id of the release draft
+echo "$CURL_RESPONSE" | jq -r ".id"

runtime-watcher/scripts/release/get_last_release.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o pipefail
+
+GITHUB_URL=https://api.github.com/repos/${CODE_REPOSITORY}
+
+CURL_RESPONSE=$(curl -L \
+  -s \
+  --fail-with-body \
+  -H "Accept: application/vnd.github+json" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  "${GITHUB_URL}"/releases/latest) 
+
+CURL_EXIT_CODE=$?
+
+if [[ ${CURL_EXIT_CODE} == 0 ]]; then
+    echo "${CURL_RESPONSE}" | jq -r .tag_name
+else
+    echo "Can't find any previous release - unable to generate changelog"
+fi
+
+exit ${CURL_EXIT_CODE}

runtime-watcher/scripts/release/get_release_by_tag.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o pipefail
+
+RELEASE_TAG=$1
+
+GITHUB_URL=https://api.github.com/repos/${CODE_REPOSITORY}
+GITHUB_AUTH_HEADER="Authorization: Bearer ${GITHUB_TOKEN}"
+
+CURL_RESPONSE=$(curl -L \
+  -s \
+  --fail-with-body \
+  -H "Accept: application/vnd.github+json" \
+  -H "${GITHUB_AUTH_HEADER}" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  "${GITHUB_URL}"/releases/tags/$RELEASE_TAG) 
+
+CURL_EXIT_CODE=$?
+
+if [[ ${CURL_EXIT_CODE} == 0 ]]; then
+    echo "Release with tag: $RELEASE_TAG already exists!"
+    exit 1
+fi
+
+exit 0

runtime-watcher/scripts/release/publish_release.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o errexit
+set -E
+set -o pipefail
+
+RELEASE_ID=$1
+
+GITHUB_URL=https://api.github.com/repos/${CODE_REPOSITORY}
+GITHUB_AUTH_HEADER="Authorization: Bearer ${GITHUB_TOKEN}"
+
+CURL_RESPONSE=$(curl -L \
+  -s \
+  --fail-with-body \
+  -X POST \
+  -H "Accept: application/vnd.github+json" \
+  -H "${GITHUB_AUTH_HEADER}" \
+  -H "X-GitHub-Api-Version: 2022-11-28" \
+  "${GITHUB_URL}"/releases/"${RELEASE_ID}" \
+  -d '{"draft":false}')
+echo "$CURL_RESPONSE"
+

runtime-watcher/scripts/release/wait_for_image.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o errexit
+set -E
+set -o pipefail
+
+DOCKER_IMAGE=$1
+ITERATIONS="${2:-30}"
+SLEEP_TIME="${3:-30}"
+
+for (( c=1; c<=$ITERATIONS; c++ ))
+do
+    if $(docker manifest inspect $1 > /dev/null 2>&1); then
+	    exit 0
+    fi
+    echo "Attempt $c: Docker image: $DOCKER_IMAGE doesn't exist"
+    if [[ $c -lt $ITERATIONS ]]; then
+        sleep ${SLEEP_TIME}
+    fi
+done
+
+echo "Fail: Docker image: $DOCKER_IMAGE doesn't exist"
+exit 1
+