Can't add Souin cache Caddy plugin

[gaspardphilibert]

Hi ! I tried (out of curiosity) to add Souin Caddy plugin as described in https://github.com/dunglas/frankenphp/blob/main/docs/docker.md which means I used something like this :

FROM dunglas/frankenphp:latest-builder AS builder

# Copy xcaddy in the builder image
COPY --from=caddy:builder /usr/bin/xcaddy /usr/bin/xcaddy

# CGO must be enabled to build FrankenPHP
ENV CGO_ENABLED=1 XCADDY_SETCAP=1
RUN xcaddy build \
    --output /usr/local/bin/frankenphp \
    --with github.com/dunglas/frankenphp=./ \
    --with github.com/dunglas/frankenphp/caddy=./caddy/ \
    # Mercure and Vulcain are included in the official build, but feel free to remove them
    --with github.com/dunglas/mercure/caddy \
    --with github.com/dunglas/vulcain/caddy \
    --with github.com/darkweak/souin/plugins/caddy
    # Add extra Caddy modules here

FROM dunglas/frankenphp AS runner

# Replace the official binary by the one contained your custom modules
COPY --from=builder /usr/local/bin/frankenphp /usr/local/bin/frankenphp

Unfortunately, it does not work, I've got this error when trying to build the Docker image:

/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/usr/bin/ld: /tmp/go-link-3759533254/000003.o: warning: relocation against `sapi_module' in read-only section `.text'
/usr/bin/ld: /tmp/go-link-3759533254/000003.o: relocation R_X86_64_PC32 against symbol `stderr@@GLIBC_2.2.5' can not be used when making a PDE object; recompile with -fPIE
/usr/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status

I can build caddy with Souin or FrankenPHP but not both of them.
I tried to build with PIE (GOFLAGS='-buildmode=pie'): it does build (with warnings) but that's not working.

I want to know if it is expected (plugins are incompatible) and if something can be done to fix this issue (perhaps I missed something).
Thanks

[withinboredom]

A little late to the party, but you may also need to set CGO_CFLAGS and CGO_LDFLAGS to -fPIE and -pie, respectively.

See #374