Add workflow and customize scripts

.github/workflows/release.yml

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+name: Release
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - v*
+
+permissions:
+  contents: write
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  # these are overwritten by "settings.sh"
+  DEBIAN_VERSION: ""
+  DEBIAN_VERNAME: ""
+  DEBIAN_RELEASE: ""
+  DEBIAN_FILEURL: ""
+  GIT_CACHE_NAME: ""
+  GITHUB_RELEASE: ""
+  SOURCE_IMGFILE: ""
+  TARGET_IMGFILE: ""
+
+jobs:
+  release:
+    name: Create release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Load settings
+        run: source settings.sh
+
+      - name: Create a new GitHub Release
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          # Create a new GitHub Release if it does not exists
+          gh release list | grep "${{ github.ref_name }}" ||
+            gh release create "${{ github.ref_name }}" \
+              --repo="${{ github.repository }}" \
+              --title="${{ github.ref_name }}" \
+              --notes="Debian ${{ env.DEBIAN_VERSION }} \"${{ env.DEBIAN_VERNAME }}\" ${{ env.DEBIAN_RELEASE }}" \
+              --verify-tag \
+              --latest
+
+  download:
+    name: Download base image
+    needs: release
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Load settings
+        run: source settings.sh
+
+      - id: cache
+        name: Cache
+        uses: actions/cache@v4
+        with:
+          key: ${{ env.GIT_CACHE_NAME }}
+          path: ${{ env.SOURCE_IMGFILE }}
+
+      - name: Download base image
+        run: wget "${{ env.DEBIAN_FILEURL }}" -O ${{ env.SOURCE_IMGFILE }}
+        if: steps.cache.outputs.cache-hit != 'true'
+
+      - name: Upload original image artifact
+        run: gh release upload "${{ env.GITHUB_RELEASE }}" ${{ env.SOURCE_IMGFILE }} --clobber
+
+  customize:
+    name: Customize image
+    needs: download
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        variant: [qemu]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Load settings
+        run: source settings.sh ${{ matrix.variant }}
+
+      - name: Load cached files
+        uses: actions/cache@v4
+        with:
+          key: ${{ env.GIT_CACHE_NAME }}
+          path: ${{ env.SOURCE_IMGFILE }}
+
+      - name: Install libguestfs
+        run: sudo apt-get install -y libguestfs-tools
+
+      - name: Rebuild image
+        run: |
+          sudo virt-customize -a "${{ env.SOURCE_IMGFILE }}" \
+            --run "customize-${{ matrix.variant }}.sh" \
+            --run-command "apt-get --yes autoremove" \
+            --run-command "apt-get --yes clean autoclean" \
+            --run-command "rm -rf /var/lib/apt/lists/*" \
+            --no-logfile
+
+      - name: Compress image artifact
+        run: sudo virt-sparsify ${{ env.SOURCE_IMGFILE }} --compress ${{ env.TARGET_IMGFILE }}
+
+      - name: Upload custom image to a GitHub Release
+        run: gh release upload "${{ env.GITHUB_RELEASE }}" ${{ env.TARGET_IMGFILE }} --clobber

customize-qemu.sh

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+#!/usr/bin/env bash
+
+# Install packages
+apt-get --yes update
+apt-get --yes install qemu-guest-agent

settings.sh

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+#!/usr/bin/env bash
+
+# Debian
+DEBIAN_VERSION="12"
+DEBIAN_VERNAME="bookworm"
+DEBIAN_RELEASE="20240415-1718"
+DEBIAN_VARIANT="genericcloud-amd64"
+DEBIAN_BASEURL="https://cloud.debian.org/images/cloud"
+DEBIAN_FILEURL="$DEBIAN_BASEURL/$DEBIAN_VERNAME/$DEBIAN_RELEASE/debian-${DEBIAN_VERSION}-${DEBIAN_VARIANT}-${DEBIAN_RELEASE}.qcow2"
+
+# Image filename
+SOURCE_IMGFILE="$(basename $DEBIAN_FILEURL)"
+TARGET_IMGFILE="${SOURCE_IMGFILE/genericcloud/$1}"
+
+# GitHub cache
+GIT_CACHE_NAME="debian-$DEBIAN_VERSION-$DEBIAN_VARIANT-$DEBIAN_RELEASE"
+
+# GitHub release name
+if [[ "${GITHUB_REF_NAME}" == "refs/tags/*" ]]; then
+	GITHUB_RELEASE="${GITHUB_REF_NAME}"
+else
+	GITHUB_RELEASE="v${DEBIAN_VERSION}-${DEBIAN_RELEASE}"
+fi
+
+# Export variables to github workflow
+if [[ -f "$GITHUB_ENV" ]]; then
+cat >> "$GITHUB_ENV" <<-EOF
+	DEBIAN_VERSION=$DEBIAN_VERSION
+	DEBIAN_VERNAME=$DEBIAN_VERNAME
+	DEBIAN_RELEASE=$DEBIAN_RELEASE
+	DEBIAN_FILEURL=$DEBIAN_FILEURL
+	GIT_CACHE_NAME=$GIT_CACHE_NAME
+	GITHUB_RELEASE=$GITHUB_RELEASE
+	SOURCE_IMGFILE=$SOURCE_IMGFILE
+	TARGET_IMGFILE=$TARGET_IMGFILE
+EOF
+fi