build: add ci

.dockerignore

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+.git
+.devcontainer
+.github
+
+config
+db
+dist
+
+other
+!other/swagger
+
+.editorconfig
+README.md
+
+**/.DS_Store

.github/workflows/go.yaml

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+name: Build and publish image
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Login to the container registry ${{ env.REGISTRY }}
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+# Build stage
+FROM golang:1.20-alpine AS builder
+WORKDIR /app
+RUN apk add make
+
+COPY ./ ./
+RUN go mod download
+RUN make build
+
+# Runner stage
+FROM scratch AS runner
+WORKDIR /app
+
+COPY --from=builder /app/dist/ ./
+
+EXPOSE 3000
+CMD ["/app/codern"]