feat(proxy): add layer 4 proxy, add docker image

Author: initdc

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM --platform=$BUILDPLATFORM golang:alpine AS build
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+
+RUN set -e \
+ && apk add --no-cache ca-certificates wget
+
+RUN set -e \
+ && wget "https://caddyserver.com/api/download?os=$(go env GOOS)&arch=$(go env GOARCH)&p=github.com%2Fmholt%2Fcaddy-l4" \
+ -O /root/caddy \
+ && chmod +x /root/caddy
+
+FROM alpine
+COPY --from=build /root/caddy /usr/local/bin/caddy
+
+WORKDIR /root
+COPY caddy.json .
+
+EXPOSE 2201
+CMD ["/usr/local/bin/caddy", "run", "--config", "/root/caddy.json"]

Dockerfile.dev

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+FROM alpine
+
+# speed up domain
+ADD "https://static.0fd.net/caddyserver.com/api/download?os=linux&arch=amd64&p=github.com%2Fmholt%2Fcaddy-l4" /usr/local/bin/caddy
+RUN set -e \
+ && chmod +x /usr/local/bin/caddy
+
+WORKDIR /root
+COPY caddy.json .
+
+EXPOSE 2201
+CMD ["/usr/local/bin/caddy", "run", "--config", "/root/caddy.json"]