Create releases automatically when VERSION is updated (contiv#4)

Signed-off-by: Antonin Bas <[email protected]>

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Release
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'VERSION'
+
+jobs:
+  release:
+    runs-on: [ubuntu-latest]
+    steps:
+    - name: Check-out code
+      uses: actions/checkout@v2
+    - name: Read version
+      run: |
+        echo "version=$(head VERSION)" >> $GITHUB_ENV
+    - name: Create release
+      uses: ncipollo/release-action@v1
+      with:
+        omitBody: true
+        token: "${{ secrets.GITHUB_TOKEN }}"
+        tag: "${{ env.version }}"
+        commit: "${{ env.GITHUB_SHA }}"

CONTRIBUTING.md

@@ -4,6 +4,13 @@ Thank you for taking the time out to contribute to project Antrea!
 
 ## Contribute
 
+### Versioning
+
+This project follows the [semantic versioning
+specification](https://semver.org/). A new Github release is created
+automatically whenever a commit is pushed to the "main" branch which modifies
+the `VERSION` file.
+
 ### Inclusive Naming
 
 For symbol names and documentation, do not introduce new usage of harmful

VERSION

@@ -0,0 +1 @@
+v0.1.0