CI: rework Github workflows

.github/workflows/build.yml

@@ -0,0 +1,107 @@
+name: CI
+on:
+  push:
+    paths:
+      - .github/workflows/build.yml
+      - cmd/**
+      - internal/**
+      - pkg/**
+      - .dockerignore
+      - .golangci.yml
+      - Dockerfile
+      - go.mod
+      - go.sum
+  pull_request:
+    paths:
+      - .github/workflows/build.yml
+      - cmd/**
+      - internal/**
+      - pkg/**
+      - .dockerignore
+      - .golangci.yml
+      - Dockerfile
+      - go.mod
+      - go.sum
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_BUILDKIT: "1"
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Linting
+        run: docker build --target lint .
+
+      - name: Go mod tidy check
+        run: docker build --target tidy .
+
+      - name: Build test image
+        run: docker build --target test -t test-container .
+
+      - name: Run tests in test container
+        run: |
+          touch coverage.txt
+          docker run --rm \
+          -v "$(pwd)/coverage.txt:/tmp/gobuild/coverage.txt" \
+          test-container \
+          go test \
+          -race \
+          -coverpkg=./... \
+          -coverprofile=coverage.txt \
+          -covermode=atomic \
+          ./...
+
+      # We run this here to use the caching of the previous steps
+      - name: Build final image
+        run: docker build .
+
+  publish:
+    needs: [verify]
+    if: github.event_name == 'push'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+
+      - uses: docker/login-action@v1
+        with:
+          username: qmcgaw
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Set variables
+        id: vars
+        run: |
+          BRANCH=${GITHUB_REF#refs/heads/}
+          TAG=${GITHUB_REF#refs/tags/}
+          echo ::set-output name=commit::$(git rev-parse --short HEAD)
+          echo ::set-output name=build_date::$(date -u +%Y-%m-%dT%H:%M:%SZ)
+          if [ "$TAG" != "$GITHUB_REF" ]; then
+            echo ::set-output name=version::$TAG
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/s390x,linux/ppc64le,linux/riscv64
+          elif [ "$BRANCH" = "main" ]; then
+            echo ::set-output name=version::latest
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/s390x,linux/ppc64le,linux/riscv64
+          else
+            echo ::set-output name=version::$BRANCH
+            echo ::set-output name=platforms::linux/amd64
+          fi
+
+      - name: Build and push final image
+        uses: docker/build-push-action@v2
+        with:
+          platforms: ${{ steps.vars.outputs.platforms }}
+          build-args: |
+            BUILD_DATE=${{ steps.vars.outputs.build_date }}
+            COMMIT=${{ steps.vars.outputs.commit }}
+            VERSION=${{ steps.vars.outputs.version }}
+          tags: qmcgaw/ddns-updater:${{ steps.vars.outputs.version }}
+          push: true
+
+      - if: github.event.ref == 'refs/heads/main'
+        name: Microbadger hook
+        run: curl -X POST https://hooks.microbadger.com/images/qmcgaw/ddns-updater/t2fcZxog8ce_kJYJ61JjkYwHF5s=
+        continue-on-error: true

Dockerfile

@@ -10,19 +10,23 @@ RUN mkdir /tmp/data && \
 
 FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base
 ENV CGO_ENABLED=0
-# g++ is installed for the -race detector in go test
-RUN apk --update add git g++
+RUN apk --update add git
 WORKDIR /tmp/gobuild
-ARG GOLANGCI_LINT_VERSION=v1.33.0
-RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | \
-    sh -s -- -b /usr/local/bin ${GOLANGCI_LINT_VERSION}
 # Copy repository code and install Go dependencies
 COPY go.mod go.sum ./
 RUN go mod download
 COPY cmd/ ./cmd/
 COPY internal/ ./internal/
 
+FROM --platform=$BUILDPLATFORM base AS test
+ENV CGO_ENABLED=1
+# g++ is installed for the -race detector in go test
+RUN apk --update add g++
+
 FROM --platform=$BUILDPLATFORM base AS lint
+ARG GOLANGCI_LINT_VERSION=v1.33.0
+RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | \
+    sh -s -- -b /usr/local/bin ${GOLANGCI_LINT_VERSION}
 COPY .golangci.yml ./
 RUN golangci-lint run --timeout=10m