add scripts/release.sh for building release binaries (#2399)

scripts/release.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# This script performs a release build similar to what CI/CD does
+# It just does everything at once :)
+#
+# It can be useful if one needs to build the release binaries manually
+
+O="--extra-experimental-features nix-command --extra-experimental-features flakes"
+
+nix build $O '.#pwndbg' -o result-pwndbg
+nix build $O '.#rpm' -o dist-rpm
+nix build $O '.#deb' -o dist-deb
+nix build $O '.#apk' -o dist-apk
+nix build $O '.#archlinux' -o dist-archlinux
+nix build $O '.#tarball' -o dist-tarball