ci: Publish images to ghcr.io

Signed-off-by: Peter Motičák <[email protected]>

Author: pemoticak

.github/workflows/build-images.yml renamed to .github/workflows/build-images-dockerhub.yml

@@ -1,4 +1,4 @@
-name: Build Images
+name: Build Images (Docker Hub)
 
 on:
   pull_request:

.github/workflows/build-images-ghcr.yml

@@ -0,0 +1,73 @@
+name: Build Images (ghcr.io)
+
+on:
+  pull_request:
+    branches: 
+      - master
+  push:
+    branches: 
+      - master
+  schedule:
+    - cron: '0 */12 * * *'
+  workflow_dispatch:
+
+jobs:
+  build-images:
+    name: "VPP ${{ matrix.tag }}"
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    env:
+      REGISTRY: ghcr.io
+      IMG_NAME: ${{ github.repository }}
+      REPO: ${{ matrix.repo }}
+      TAG: ${{ matrix.tag }}
+    strategy:
+      fail-fast: false
+      matrix:
+        tag: ['master', 'latest', '23.02', '22.10', '22.06', '22.02']
+        include:
+        - tag: 'master'
+          repo: 'master'
+        - tag: 'latest'
+          repo: 'release'
+        - tag: '23.02'
+          repo: '2302'
+        - tag: '22.10'
+          repo: '2210'
+        - tag: '22.06'
+          repo: '2206'
+        - tag: '22.02'
+          repo: '2202'
+    
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Build image
+      run: |
+        env | sort
+        docker build --build-arg REPO="$REPO" --tag "$REGISTRY/$IMG_NAME:$TAG" .
+        docker run --rm "$REGISTRY/$IMG_NAME:$TAG" dpkg-query -f '${Version}' -W vpp
+        VPP_VERSION=$(docker run --rm "$REGISTRY/$IMG_NAME:$TAG" cat /vpp/version | cut -d'~' -f1,2 | sed -e 's/~/./g')
+        echo "VPP_VERSION=$VPP_VERSION" >> $GITHUB_ENV
+
+    - name: Check if image already published
+      if: github.event_name != 'pull_request'
+      run: |
+        docker tag "$REGISTRY/$IMG_NAME:$TAG" "$REGISTRY/$IMG_NAME:${{ env.VPP_VERSION }}"
+        docker images "$REGISTRY/$IMG_NAME"
+        GHCR_TOKEN=$(echo ${{ secrets.GITHUB_TOKEN }} | base64)
+        if [ ${{ github.event_name }} == "schedule" ] \
+          && curl --head --fail -H "Authorization: Bearer ${GHCR_TOKEN}" https://$REGISTRY/v2/$IMG_NAME/manifests/${{ env.VPP_VERSION }}; then
+          echo "Image $REGISTRY/$IMG_NAME:${{ env.VPP_VERSION }} has already been published"
+          exit 1
+        fi
+
+    - name: Publish image
+      if: github.event_name != 'pull_request' && success()
+      run: |
+        echo "${{ secrets.GITHUB_TOKEN }}" | docker login "$REGISTRY" -u "${{ github.actor }}" --password-stdin
+        docker push "$REGISTRY/$IMG_NAME:${{ env.VPP_VERSION }}"
+        docker push "$REGISTRY/$IMG_NAME:$TAG"