FROM caddy:2.9.1-builder-alpine@sha256:c82c536196354acff870ce9f99795ed7bff7d1ed85c52c8d3f10a1688a947de3 AS builder RUN xcaddy build \ --with github.com/caddy-dns/rfc2136@master FROM caddy:2.9.1-alpine@sha256:eed289e78b2a0fa7d856b5d5aa9f0b39f727ab49c92f27986f1c03291c42f119 COPY --from=builder /usr/bin/caddy /usr/bin/caddy