add pipeline for building and pushing the docker image to GHCR

.github/workflows/docker-release.yaml

@@ -0,0 +1,52 @@
+name: Create and publish a Docker image
+
+on:
+    release:
+        types: [published]
+
+env:
+    REGISTRY: ghcr.io
+    IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+    build-and-push-image:
+        runs-on: ubuntu-latest
+
+        permissions:
+            contents: read
+            packages: write
+            attestations: write
+            id-token: write
+
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v4
+
+            - name: Log in to the Container registry
+              uses: docker/login-action@v3
+              with:
+                  registry: ${{ env.REGISTRY }}
+                  username: ${{ github.actor }}
+                  password: ${{ secrets.GITHUB_TOKEN }}
+
+            - name: Extract metadata (tags, labels) for Docker
+              id: meta
+              uses: docker/metadata-action@v5
+              with:
+                  images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+            - name: Build and push Docker image
+              id: push
+              uses: docker/build-push-action@v5
+              with:
+                  context: .
+                  push: true
+                  tags: ${{ steps.meta.outputs.tags }}
+                  labels: ${{ steps.meta.outputs.labels }}
+
+            - name: Generate artifact attestation
+              uses: actions/attest-build-provenance@v1
+              with:
+                  subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+                  subject-digest: ${{ steps.push.outputs.digest }}
+                  push-to-registry: true

Dockerfile

@@ -0,0 +1,25 @@
+FROM node:lts-alpine as builder
+
+ARG version=3.9.6
+
+RUN apk add --no-cache git python3 py3-pip make g++
+
+WORKDIR /app
+
+RUN git clone https://github.com/zone-eu/zone-mta-template ./
+
+RUN npm install zone-mta@${version}
+RUN npm install --production
+RUN npm install zonemta-wildduck
+
+FROM node:lts-alpine as app
+
+ENV NODE_ENV production
+
+RUN apk add --no-cache tini
+
+WORKDIR /app
+COPY --from=builder /app /app
+
+ENTRYPOINT ["/sbin/tini", "--", "node", "index.js"]
+CMD ["--config=config/zonemta.toml"]