community/cargo-gra:enable on loongarch64

loongarch64 has supported nix crate

community/cargo-gra/APKBUILD

@@ -5,8 +5,7 @@ pkgver=0.6.2
 pkgrel=0
 pkgdesc="gtk-rust-app CLI for building Flatpak apps with ease"
 url="https://gitlab.com/floers/cargo-gra"
-# loongarch64: fails to build nix crate on loongarch64
-arch="all !s390x !loongarch64" # not interested in debugging issues on s390x
+arch="all !s390x" # not interested in debugging issues on s390x
 license="GPL-3.0-or-later"
 makedepends="cargo cargo-auditable"
 source="https://gitlab.com/floers/cargo-gra/-/archive/v$pkgver/cargo-gra-v$pkgver.tar.gz"