Add Dockerfile

Dockerfile

@@ -0,0 +1,10 @@
+ARG CADDY_VERSION
+FROM caddy:${CADDY_VERSION}-builder AS builder
+ARG CADDY_DOCKER_PROXY_VERSION
+RUN xcaddy build \
+    --with github.com/lucaslorentz/caddy-docker-proxy/v2@v${CADDY_DOCKER_PROXY_VERSION} \
+    --with github.com/caddy-dns/ovh
+
+FROM caddy:${CADDY_VERSION}-alpine
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy
+CMD ["caddy", "docker-proxy"]