Implement ci workflow

.github/workflows/ci.yml

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+name: ci
+on: [push]
+
+jobs:
+  hadolint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: hadolint/[email protected]
+        with:
+          ignore: DL3018
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.18
+      - name: Lint & Test
+        run: make setup-ci ci
+  docker:
+    needs: [hadolint, test]
+    runs-on: ubuntu-latest
+    env:
+      IMGTAG: ghcr.io/avakarev/lidl-connect-exporter
+    steps:
+      - uses: actions/checkout@v3
+      - id: git
+        run: |
+          echo "::set-output name=sha::$(git rev-parse --short HEAD)"
+          echo "::set-output name=ref::${GITHUB_REF##*/}"
+      - uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/build-push-action@v3
+        with:
+          tags: |
+            ${{ env.IMGTAG }}:${{ steps.git.outputs.sha }}
+            ${{ env.IMGTAG }}:${{ steps.git.outputs.ref }}
+          build-args: |
+            GITHUB_SHA=${{ steps.git.outputs.sha }}
+            GITHUB_REF=${{ steps.git.outputs.ref }}
+          push: true

Dockerfile

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+ARG GO_VERSION=1.18
+
+FROM golang:${GO_VERSION}-alpine AS builder
+ARG GITHUB_SHA
+ARG GITHUB_REF
+RUN apk add --no-cache ca-certificates tzdata make
+WORKDIR /src
+COPY go.mod go.sum Makefile ./
+RUN go mod download
+COPY cmd ./cmd
+COPY internal ./internal
+RUN make build
+
+FROM scratch
+USER 1000
+WORKDIR /app
+COPY --from=builder /src/bin/server /app/server
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+CMD ["/app/server"]