feat(coredns): add image

.github/workflows/build-coredns.yml

@@ -0,0 +1,45 @@
+---
+name: Build CoreDNS image
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'coredns/**'
+      - '!coredns/README.md'
+      - '.github/workflows/build-coredns.yml'
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      matrix:
+        version: ['1.11.1']
+    steps:
+      - name: Check-out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push image to registry
+        uses: docker/build-push-action@v5
+        with:
+          platforms: linux/amd64
+          context: ./coredns
+          file: ./coredns/Dockerfile
+          push: true
+          build-args: |
+            VERSION=${{ matrix.version }}
+          tags: |
+            ghcr.io/f-bn/coredns:${{ matrix.version }}

coredns/Dockerfile

@@ -0,0 +1,42 @@
+# --- Build stage ---
+FROM docker.io/golang:1.20 AS build
+
+ARG TARGETOS
+ARG TARGETARCH
+ARG VERSION=1.11.1
+
+ENV GOOS=${TARGETOS}
+ENV GOARCH=${TARGETARCH}
+ENV CGO_ENABLED=0
+
+RUN set -ex ; \
+  export DEBIAN_FRONTEND=noninteractive ; \
+  apt update ; \
+  apt install -y --no-install-recommends libcap2-bin
+
+WORKDIR /build
+
+RUN git clone --single-branch --branch v${VERSION} https://github.com/coredns/coredns.git /build
+RUN set -ex ; \
+  go build -v -ldflags="-s -w -X github.com/coredns/coredns/coremain.GitCommit=$(git rev-parse HEAD)" -o /build/bin/coredns ; \
+  setcap cap_net_bind_service=+ep /build/bin/coredns
+
+# --- Final stage ---
+FROM cgr.dev/chainguard/wolfi-base:latest
+
+ARG VERSION
+
+COPY --from=build --chmod=755 /build/bin/coredns /usr/bin/coredns
+
+USER nonroot
+
+EXPOSE 53/tcp 53/udp
+
+ENTRYPOINT [ "/usr/bin/coredns" ]
+
+LABEL \
+  org.opencontainers.image.title="CoreDNS" \
+  org.opencontainers.image.source="https://github.com/f-bn/containers-images/coredns" \
+  org.opencontainers.image.description="CoreDNS is a DNS server that chains plugins" \
+  org.opencontainers.image.licenses="Apache-2.0" \
+  org.opencontainers.image.authors="Florian Bobin <[email protected]>"

coredns/README.md

@@ -0,0 +1,5 @@
+## General informations
+
+Custom CoreDNS image built from sources.
+
+Built with Go 1.20.