feat(coredns): re-enable image build

.github/workflows/build-coredns.yml

@@ -0,0 +1,48 @@
+---
+name: Build CoreDNS image
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'coredns/**'
+      - '!coredns/README.md'
+      - '.github/workflows/build-coredns.yml'
+  workflow_dispatch:
+  schedule:
+    - cron: '35 4 * * 6' # Every Saturday at 04:35am
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      matrix:
+        version: ['1.11.3']
+    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 }}
+            ghcr.io/f-bn/coredns:latest

coredns/Dockerfile

@@ -1,9 +1,9 @@
 # --- Build stage ---
-FROM docker.io/golang:1.20 AS build
+FROM docker.io/golang:1.22 AS build
 
 ARG TARGETOS
 ARG TARGETARCH
-ARG VERSION=1.11.1
+ARG VERSION=1.11.3
 
 ENV GOOS=${TARGETOS}
 ENV GOARCH=${TARGETARCH}
@@ -24,18 +24,18 @@ RUN set -ex ; \
 # --- Final stage ---
 FROM cgr.dev/chainguard/wolfi-base:latest
 
-ARG VERSION
-
 COPY --from=build --chmod=755 /build/bin/coredns /usr/bin/coredns
 
+RUN mkdir -p /etc/coredns
+
 USER nonroot
 
 EXPOSE 53/tcp 53/udp
 
 ENTRYPOINT [ "/usr/bin/coredns" ]
 
 LABEL \
-  org.opencontainers.image.title="CoreDNS" \
+  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" \

coredns/README.md

@@ -2,4 +2,17 @@
 
 Custom CoreDNS image built from sources.
 
-Built with Go 1.20.
+Built with Go 1.22.
+
+## CoreDNS configuration
+
+This image doesn't come with a default CoreDNS configuration. You can bring your own configuration to the container (e.g using Docker):
+
+```shell
+$ docker run [options] \
+    -v Corefile:/etc/coredns/Corefile:ro \
+    -v /path/to/zonefiles:/etc/coredns/zones:ro \
+    ghcr.io/f-bn/coredns:1.11.3 -conf /etc/coredns/Corefile
+```
+
+More informations about CoreDNS configuration [here](https://coredns.io/manual/configuration/).