Add docker image

.github/workflows/ci.yaml

@@ -66,3 +66,26 @@ jobs:
           earthly --ci +release \
             --RELEASE_VERSION=${GITHUB_REF:10} \
             --GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}
+
+      - name: Put back the git branch into git (Earthly uses it for tagging)
+        run: |
+          branch=""
+          if [ -n "$GITHUB_HEAD_REF" ]; then
+            branch="$GITHUB_HEAD_REF"
+          else
+            branch="${GITHUB_REF##*/}"
+          fi
+          git checkout -b "$branch" || true
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ vars.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_TOKEN }}
+
+      - name: Build and push docker image
+        run: |
+          earthly --ci --push +image \
+            --TARGET_DOCKER_REGISTRY=ghcr.io/librepod \
+            --RELEASE_VERSION=${{ github.ref_name }}

Earthfile

@@ -1,5 +1,7 @@
 VERSION 0.7
 
+ARG --global TARGET_DOCKER_REGISTRY
+
 FROM golang:1.18-bullseye
 
 validate-pr:
@@ -11,7 +13,7 @@ validate-pr:
   SAVE ARTIFACT build /build AS LOCAL ./build
 
 multi-build:
-  ARG --required RELEASE_VERSION
+  ARG RELEASE_VERSION=latest
   ENV PLATFORMS="darwin/amd64 darwin/arm64 windows/amd64 linux/amd64 linux/arm64"
   ENV VERSION_INJECT="github.com/librepod/frp-port-keeper/main.Version"
   ENV OUTPUT_PATH_FORMAT="./build/${RELEASE_VERSION}/{{.OS}}/{{.Arch}}/frp-port-keeper"
@@ -68,6 +70,17 @@ release:
 
   SAVE ARTIFACT build /build AS LOCAL ./build
 
+image:
+  FROM golang:1.18-alpine3.17
+  LABEL org.opencontainers.image.source="https://github.com/librepod/frp-port-keeper"
+  ARG RELEASE_VERSION=latest
+  COPY +multi-build/build /build
+  WORKDIR /build
+  EXPOSE 8080
+  RUN ls -al /build
+  CMD ["/build/frp-port-keeper"]
+  SAVE IMAGE --push ${TARGET_DOCKER_REGISTRY}/frp-port-keeper:$RELEASE_VERSION
+
 validate-mr:
   # Smoke test the application
   # TODO: set proper validation