add a ghcr.io container artifact for metal-cli relesaes

Signed-off-by: Marques Johansson <mjohansson@equinix.com>

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
         uses: goreleaser/goreleaser-action@v4
         with:
           version: latest
-          args: release --rm-dist
+          args: release --clean
         env:
           # GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           # 

.goreleaser.yml

@@ -57,3 +57,17 @@ brews:
     tap:
       owner: equinix
       name: homebrew-tap
+
+dockers:
+  - image_templates:
+      - 'ghcr.io/{{ .Env.GITHUB_REPOSITORY }}:{{ .Tag }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    dockerfile: Dockerfile
+    use: buildx
+    build_flag_templates:
+      - "--pull"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.name={{.ProjectName}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+      - "--label=org.opencontainers.image.source={{.GitURL}}"
+      - "--platform=linux/{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"

Dockerfile

@@ -0,0 +1,25 @@
+# syntax=docker/dockerfile:1
+
+## Build
+FROM golang:1.19-alpine AS build
+
+WORKDIR /app
+
+COPY go.mod ./
+COPY go.sum ./
+RUN go mod download
+
+COPY ./cmd/. ./cmd/
+COPY ./internal/. ./internal/
+RUN go build -o /metal ./cmd/metal
+
+## Image
+FROM scratch
+
+WORKDIR /
+
+COPY --from=build /metal /metal
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["/metal"]