ci: publish container image to ghcr

.github/workflows/release-image.yml

@@ -0,0 +1,53 @@
+name: Release Image
+
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract image metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=tag
+            type=raw,value=latest
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

README.md

@@ -164,3 +164,14 @@ Example:
 make build CONTAINER_ENGINE=docker IMAGE_TAG=dev
 make run CONTAINER_ENGINE=docker PORT=8080 ENV_FILE=.env
 ```
+
+## GitHub Packages (GHCR)
+- Automated image publishing is configured in `.github/workflows/release-image.yml`.
+- On push of a release tag (for example `v0.2.0`), CI builds and pushes:
+  - `ghcr.io/furyhawk/api_gateway:v0.2.0`
+  - `ghcr.io/furyhawk/api_gateway:latest`
+
+Pull example:
+```bash
+docker pull ghcr.io/furyhawk/api_gateway:v0.2.0
+```