Build & Publish Docker image with CICD

.github/workflows/publish-image.yml

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+name: Docker Build Image & publish to GHCR
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    paths:
+      - '.github/workflows/publish-image.yml'
+jobs:
+  build-and-push:
+    runs-on: ubuntu-24.04-arm
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Format repo slug
+        uses: actions/github-script@v4
+        id: repo_slug
+        with:
+          result-encoding: string
+          script: return `ghcr.io/${context.repo.owner.toLowerCase()}/${context.repo.repo.toLowerCase()}`
+
+      - name: Echo repository slug
+        run: |
+          echo "Repository slug: ${{ steps.repo_slug.outputs.result }}"
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: ${{ steps.repo_slug.outputs.result }}:latest

docker/Dockerfile

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+FROM golang:1.24-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o lumos-discord-bot .
+
+FROM alpine:latest
+
+RUN apk add --no-cache ca-certificates
+
+WORKDIR /app
+
+COPY --from=builder /app/lumos-discord-bot .
+
+ENTRYPOINT ["./lumos-discord-bot"]