#2114 - Fix issue of wrong platform used during docker build

[lmmendes]

Context

Removed --platform=$BUILDPLATFORM from the Dockerfile this was overriding the buildx configuration set by goreleaser.yaml .

Testing

Assuming that a new release was created, and published to DockerHub and the following commands are run on a Arm64 machine:

$ docker run -ti --rm --entrypoint /bin/sh knadh/listmonk:latest

$ apk add file

$ file /bin/busybox
/bin/busybox: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-aarch64.so.1, BuildID[sha1]=0473dd0398a4d4c4f29ebed5a94f63d78096563e, stripped

The output of the file /bin/busybox should include ARM aarch64 meaning that the base image is Arm64.