feat: Add GitHub Actions workflows for uploading CDN images to GHCR and Docker Hub

.github/workflows/cdn-release.yml

@@ -0,0 +1,43 @@
+name: Upload the tagged release CDN image to GHCR and Docker Hub
+
+on:
+  release:
+    types: [released]
+
+env:
+  IMAGE_NAME: "adventurelog-cdn"
+
+jobs:
+  upload:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.ACCESS_TOKEN }}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: set lower case owner name
+        run: |
+          echo "REPO_OWNER=${OWNER,,}" >>${GITHUB_ENV}
+        env:
+          OWNER: "${{ github.repository_owner }}"
+
+      - name: Build Docker images
+        run: docker buildx build --platform linux/amd64,linux/arm64 --push -t ghcr.io/$REPO_OWNER/$IMAGE_NAME:${{ github.event.release.tag_name }} -t ${{ secrets.DOCKERHUB_USERNAME }}/$IMAGE_NAME:${{ github.event.release.tag_name }} ./cdn