Unable to run static build

[Skaronator]

I want to try out static build but quickly noticed that they are not working in this repository.

$ git clone git@github.com:dunglas/frankenphp-demo.git
$ cd frankenphp-demo
$ docker build -t static-app -f static-build.Dockerfile .

------

 1 warning found (use docker --debug to expand):
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 1)
static-build.Dockerfile:13
--------------------
  12 |     WORKDIR /go/src/app/
  13 | >>> RUN EMBED=dist/app/ \
  14 | >>>     ./build-static.sh
  15 |
--------------------
ERROR: failed to build: failed to solve: process "/bin/ash -eo pipefail -c EMBED=dist/app/     ./build-static.sh" did not complete successfully: exit code: 2