ci: create deploy workflow

Author: NeoScript

.github/workflows/deploy_image.yml

@@ -0,0 +1,38 @@
+name: Deploy image to ghcr.io
+
+on:
+  push:
+    branches: [main]
+
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: pubsub-emulator-lite
+
+jobs:
+  build-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v5
+      - uses: docker/setup-buildx-action@v3
+        with:
+          cache-binary: false
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/metadata-action@v3
+        id: metadata
+        with:
+          images: ghcr.io/${{ env.IMAGE_NAME }}
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.metadata.outputs.tags }}
+          labels: ${{ steps.metadata.outputs.labels }}
+          platforms: linux/amd64,linux/arm64