{facts,vars}/generator: also setup /proc

some applications fail without proc

pkgs/clan-cli/clan_cli/facts/generate.py

@@ -49,6 +49,7 @@ def bubblewrap_cmd(generator: str, facts_dir: Path, secrets_dir: Path) -> list[s
             "--ro-bind", "/nix/store", "/nix/store",
             "--tmpfs",  "/usr/lib/systemd",
             "--dev", "/dev",
+            "--proc", "/proc",
             "--bind", str(facts_dir), str(facts_dir),
             "--bind", str(secrets_dir), str(secrets_dir),
             "--unshare-all",

pkgs/clan-cli/clan_cli/vars/generate.py

@@ -41,6 +41,7 @@ def bubblewrap_cmd(generator: str, tmpdir: Path) -> list[str]:
             "--ro-bind", "/nix/store", "/nix/store",
             "--tmpfs",  "/usr/lib/systemd",
             "--dev", "/dev",
+            "--proc", "/proc",
             "--bind", str(tmpdir), str(tmpdir),
             "--unshare-all",
             "--unshare-user",