coredns: add

coredns/Dockerfile

@@ -0,0 +1,13 @@
+FROM d.xr.to/base AS builder
+RUN xbps-remote go unbound-devel git make gcc
+RUN mkdir -p /root/go/src/github.com/coredns
+RUN git clone --depth=2 https://github.com/coredns/coredns.git /root/go/src/github.com/coredns/coredns
+RUN cd /root/go/src/github.com/coredns/coredns && echo 'unbound:github.com/coredns/unbound' >> plugin.cfg && sed -i '/\(grpc\|route53\|azure\|clouddns\|k8s_external\|kubernetes\)\:/d' plugin.cfg && sed -i 's:CGO_ENABLED=\$(CGO_ENABLED)::' Makefile
+RUN cd /root/go/src/github.com/coredns/coredns && go generate && make
+
+FROM d.xr.to/base
+RUN xbps-remote libunbound
+COPY --from=builder /root/go/src/github.com/coredns/coredns/coredns coredns
+COPY files/Corefile /config/Corefile
+WORKDIR "/config"
+CMD ["/coredns"]

coredns/files/Corefile

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+. {
+    unbound
+    cache
+    log
+}