Hm, i found this to be pretty straight forward through Docker:

e.g:

    FROM caddy:2-builder AS builder
    RUN xcaddy build \
        --with github.com/greenpau/caddy-security

    FROM caddy:2
    COPY --from=builder /usr/bin/caddy /usr/bin/caddy

You can keep your container image, and just do the "COPY --from=builder" step in there. We do this in CI/CD on every build.