[misc] improve goreleaser with RC handling and update docker builds (#6438)

- introduce variables to avoid publishing latest docker tags and installers
- Refactor .goreleaser.yaml to simplify docker configurations and add environment-driven flags
- removed management debug containers (it was doing only log var)
- Stopped building arm v6 32bits in favor of v7 32 bits for services (not client)
- Add target argument to docker files

management/Dockerfile.debug

@@ -1,5 +0,0 @@
-FROM ubuntu:24.04
-RUN apt update && apt install -y ca-certificates && rm -fr /var/cache/apt
-ENTRYPOINT [ "/go/bin/netbird-mgmt","management","--log-level","debug"]
-CMD ["--log-file", "console"]
-COPY netbird-mgmt /go/bin/netbird-mgmt