ci: Build and publish container image

* Builds container images using goreleaser docker

* Images built are :latest and :tag

* Images are pusblished to docker.io

* Build is triggered when a tag is pushed

.github/workflows/gorelease.yml

@@ -11,6 +11,12 @@ jobs:
         uses: actions/checkout@v2.3.3
         with:
           fetch-depth: 0
+
+      - name: Login to Docker Registry
+        run: |
+          echo "${{ secrets.DOCKERHUB_SECRET }}" | \
+          docker login -u romie --password-stdin
+
       - name: Set up Go
         uses: actions/setup-go@v2.1.3
         with:

.goreleaser.yml

@@ -32,3 +32,38 @@ builds:
     mod_timestamp: "{{ .CommitTimestamp }}"
     ldflags:
       - -s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{ .CommitDate }} -X main.builtBy=goreleaser
+
+dockers:
+  # You can have multiple Docker images.
+  -
+    # GOOS of the built binary that should be used.
+    goos: linux
+
+    # GOARCH of the built binary that should be used.
+    goarch: amd64
+
+    # Name templates of the built binaries that should be used.
+    binaries:
+    - romie
+
+    # Templates of the Docker image names.
+    image_templates:
+      - "romie/romie:latest"
+      - "romie/romie:{{ .Tag }}"
+
+    # Skips the docker push. Could be useful if you also do draft releases.
+    # If set to auto, the release will not be pushed to the docker repository
+    # in case there is an indicator for prerelease in the tag e.g. v1.0.0-rc1
+    # Defaults to false.
+    skip_push: false
+
+    # Path to the Dockerfile (from the project root).
+    dockerfile: Dockerfile
+
+    # Template of the docker build flags.
+    build_flag_templates:
+    - "--pull"
+    - "--label=org.opencontainers.image.created={{.Date}}"
+    - "--label=org.opencontainers.image.title={{.ProjectName}}"
+    - "--label=org.opencontainers.image.revision={{.FullCommit}}"
+    - "--label=org.opencontainers.image.version={{.Version}}"

Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY romie /
+ENTRYPOINT ["/romie"]