feat(bridge): create workflow for publishing bridge image (#867)

Author: renauter

.github/workflows/040_publish_activation_service_image.yml

@@ -1,4 +1,4 @@
-name: Publish Docker image
+name: Publish activation service image
 
 on:
   workflow_dispatch:

.github/workflows/050_publish_tfchainstellar_bridge_image.yml

@@ -0,0 +1,41 @@
+name: Publish bridge image
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2.1.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/threefoldtech/tfchain_stellar_bridge
+          tags: |
+            type=semver,pattern={{version}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          file: ./bridge/tfchain_bridge/Dockerfile
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}