ARG CADDY_VERSION=2.11.3
# Build a custom image of Caddy with Caddy-Docker-Proxy + L4 modules:
FROM caddy:${CADDY_VERSION}-builder AS builder
ENV GOTOOLCHAIN=auto
RUN xcaddy build \
--with github.com/mholt/caddy-l4 \
--with github.com/lucaslorentz/caddy-docker-proxy/v2@v2.12.0 

FROM caddy:${CADDY_VERSION}-alpine
COPY --link --from=builder /usr/bin/caddy /usr/bin/caddy
CMD ["caddy", "docker-proxy"]