feat: Adding docker image support with docker publish Github_action

.github/workflows/docker_publish.yml

@@ -0,0 +1,52 @@
+name: Publishing Docker image
+
+on:
+  push:
+    branches: [ "main" ]
+    paths-ignore:
+      - 'README.md'
+      - '**/*_test.go'
+  pull_request:
+    branches: [ "main" ]
+    paths-ignore:
+      - 'README.md'
+      - '**/*_test.go'
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Log in to Harbor
+        uses: docker/login-action@v3
+        with:
+          registry: demo.goharbor.io
+          username: ${{ secrets.REGISTRY_GOHARBOR_USERNAME }}
+          password: ${{ secrets.REGISTRY_GOHARBOR_PASSWORD }}
+
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@v3.1.1
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: ./Dockerfile
+          tags: demo.goharbor.io/library/harbor-cli:0.0.1
+          push: true
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Get the image digest
+        id: image_digest
+        run: |
+          echo "IMAGE_DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' demo.goharbor.io/library/harbor-cli:1.2.5)" >> $GITHUB_ENV
+
+      - name: Sign image with a key
+        run: |
+          cosign sign --yes --key env://COSIGN_PRIVATE_KEY ${{ env.IMAGE_DIGEST }}
+        env:
+          COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
+          COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}

Dockerfile

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+# Stage 1: Build the Go binary
+FROM golang:1.21-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
+RUN go mod download
+
+COPY . .
+
+RUN go build -o harbor ./cmd/harbor
+
+# Stage 2: Create a small image for the Go binary
+FROM alpine:latest
+
+WORKDIR /root/
+
+# Copy the Pre-built binary file from the previous stage
+COPY --from=builder /app/harbor .
+
+CMD ["./harbor"]