ci: share image and release actions

.gitea/actions/publish-image/action.yml

@@ -0,0 +1,39 @@
+name: Publish Docker image
+description: Build and push the maintenance image
+inputs:
+  tag:
+    required: true
+    description: Docker image tag
+  username:
+    required: true
+    description: Registry username
+  password:
+    required: true
+    description: Registry password
+runs:
+  using: composite
+  steps:
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v4.4.1
+
+    - name: Log in to registry
+      shell: bash
+      env:
+        REGISTRY_USERNAME: ${{ inputs.username }}
+        REGISTRY_PASSWORD: ${{ inputs.password }}
+      run: printf '%s' "$REGISTRY_PASSWORD" | docker login "$REGISTRY" --username "$REGISTRY_USERNAME" --password-stdin
+
+    - name: Build and push image
+      uses: docker/build-push-action@v7.4.0
+      with:
+        context: .
+        push: true
+        provenance: false
+        build-args: |
+          APP_VERSION=${{ gitea.sha }}
+          VCS_REF=${{ gitea.sha }}
+        tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ inputs.tag }}
+        labels: |
+          org.opencontainers.image.version=${{ gitea.sha }}
+          org.opencontainers.image.revision=${{ gitea.sha }}
+          org.opencontainers.image.source=${{ gitea.repositoryUrl }}