Push to Docker Hub (#44)

Author: Frenzie

.github/workflows/unit_tests.yaml

@@ -1,6 +1,10 @@
 name: Busted test suite
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  release:
+    types: [published]
 
 jobs:
   build-and-test:
@@ -17,8 +21,8 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Extract container metadata
-        id: meta
+      - name: Extract GHCR metadata
+        id: ghcr_meta
         if: github.event_name == 'push' && github.repository == 'koreader/koreader-sync-server'
         uses: docker/metadata-action@v5
         with:
@@ -28,13 +32,24 @@ jobs:
             type=ref,event=tag
             type=sha,prefix=sha-
 
+      - name: Extract Docker Hub metadata
+        id: dockerhub_meta
+        if: (startsWith(github.ref, 'refs/tags/') || github.event_name == 'release') && github.repository == 'koreader/koreader-sync-server'
+        uses: docker/metadata-action@v5
+        with:
+          images: koreader/kosync
+          tags: |
+            type=ref,event=tag
+            type=raw,value=${{ github.event.release.tag_name }},enable=${{ github.event_name == 'release' }}
+            type=raw,value=latest,enable=${{ github.event_name == 'release' }}
+
       - name: Build image
         uses: docker/build-push-action@v5
         with:
           context: .
           push: false
           load: true
-          labels: ${{ steps.meta.outputs.labels }}
+          labels: ${{ steps.ghcr_meta.outputs.labels || steps.dockerhub_meta.outputs.labels }}
           tags: |
             koreader/kosync:test
             koreader/kosync:latest
@@ -52,7 +67,7 @@ jobs:
 
       - name: Log in to GitHub Container Registry
         if: github.event_name == 'push' && github.repository == 'koreader/koreader-sync-server'
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
@@ -65,5 +80,22 @@ jobs:
             docker tag koreader/kosync:test "$tag"
             docker push "$tag"
           done <<'EOF'
-          ${{ steps.meta.outputs.tags }}
+          ${{ steps.ghcr_meta.outputs.tags }}
+          EOF
+
+      - name: Log in to Docker Hub
+        if: (startsWith(github.ref, 'refs/tags/') || github.event_name == 'release') && github.repository == 'koreader/koreader-sync-server'
+        uses: docker/login-action@v4
+        with:
+          username: frenzie
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Push Docker Hub image
+        if: (startsWith(github.ref, 'refs/tags/') || github.event_name == 'release') && github.repository == 'koreader/koreader-sync-server'
+        run: |
+          while IFS= read -r tag; do
+            docker tag koreader/kosync:test "$tag"
+            docker push "$tag"
+          done <<'EOF'
+          ${{ steps.dockerhub_meta.outputs.tags }}
           EOF