Build mysqld-exporter container image.

.github/workflows/build-mysqld-exporter-container.yaml

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+name: "Build mysqld exporter container"
+
+on:
+  pull_request:
+    paths:
+      - "containers/mysqld_exporter/**"
+      - ".github/workflows/build-mysqld-exporter-container.yaml"
+      - "!**.md"
+  push:
+    branches:
+      - 'main'
+    paths:
+      - "containers/mysqld_exporter/**"
+      - ".github/workflows/build-mysqld-exporter-container.yaml"
+      - "!**.md"
+
+jobs:
+  build:
+    runs-on: ${{ vars.IMAGE_BUILD_RUNNER || 'ubuntu-20.04' }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: docker/setup-qemu-action@v2
+      - uses: docker/setup-buildx-action@v2
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Check TAG file
+        working-directory: containers
+        run: |
+          result="$(./tag_exists moco/mysqld_exporter mysqld_exporter)"
+          if [ "$result" = ok ]; then
+            exit 1
+          fi
+          echo "TAG=$(cat ./mysqld_exporter/TAG)" >> $GITHUB_ENV
+
+      - uses: docker/build-push-action@v4
+        with:
+          context: containers/mysqld_exporter/.
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.ref == 'refs/heads/main' }}
+          tags:  ghcr.io/cybozu-go/moco/mysqld_exporter:${{ env.TAG }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

containers/mysqld_exporter/.dockerignore

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+*

containers/mysqld_exporter/Dockerfile

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+# mysqld_exporter container
+
+# Stage1: build from source
+FROM quay.io/cybozu/golang:1.19-jammy AS build
+
+ARG MYSQLD_EXPORTER_VERSION=v0.14.0
+
+RUN git clone -b ${MYSQLD_EXPORTER_VERSION} --depth 1 https://github.com/prometheus/mysqld_exporter \
+    && make -C mysqld_exporter build
+
+# Stage2: setup runtime container
+FROM scratch
+
+COPY --from=build /work/mysqld_exporter/LICENSE /LICENSE
+COPY --from=build /work/mysqld_exporter/mysqld_exporter /mysqld_exporter
+
+USER 10000:10000
+EXPOSE 9104
+
+ENTRYPOINT ["/mysqld_exporter"]

containers/mysqld_exporter/README.md

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+# mysqld_exporter
+
+This directory provides a Dockerfile to build a Docker container that runs [mysqld_exporter](https://github.com/prometheus/mysqld_exporter).
+
+Docker images
+-------------
+
+Docker images are available on [ghcr.io](https://github.com/cybozu-go/moco/pkgs/container/moco/mysqld_exporter)

containers/mysqld_exporter/TAG

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+0.14.0.1