fix(build): use supported AppImage compression (#2499)

Author: shadowfax92

packages/browseros/bos_build/steps/package/linux_packaging/system.py

@@ -88,8 +88,9 @@ def build_appimage(
     ) -> None:
         env = os.environ.copy()
         env["ARCH"] = architecture
+        # The pinned 1.9.1 tools bundle a zstd-only mksquashfs implementation.
         self._run(
-            (str(tool), "--comp", "gzip", str(appdir), str(output)),
+            (str(tool), "--comp", "zstd", str(appdir), str(output)),
             env=env,
         )
 

packages/browseros/bos_build/steps/package/linux_packaging_test.py

@@ -250,6 +250,34 @@ def extract_deb_control(self, package: Path, destination: Path) -> None:
 
 
 class LinuxToolchainAdapterTest(unittest.TestCase):
+    def test_appimagetool_uses_compressor_supported_by_pinned_tool(self) -> None:
+        completed = SimpleNamespace(returncode=0, stdout="", stderr="")
+        with (
+            mock.patch.dict(os.environ, {}, clear=True),
+            mock.patch(
+                "bos_build.steps.package.linux_packaging.system.subprocess.run",
+                return_value=completed,
+            ) as run,
+        ):
+            SubprocessLinuxToolchain().build_appimage(
+                Path("/tools/appimagetool"),
+                Path("/staging/AppDir"),
+                Path("/dist/BrowserOS.AppImage"),
+                "x86_64",
+            )
+
+        self.assertEqual(
+            run.call_args.args[0],
+            (
+                "/tools/appimagetool",
+                "--comp",
+                "zstd",
+                "/staging/AppDir",
+                "/dist/BrowserOS.AppImage",
+            ),
+        )
+        self.assertEqual(run.call_args.kwargs["env"]["ARCH"], "x86_64")
+
     def test_ldd_uses_a_stable_locale_and_checks_both_output_streams(self) -> None:
         completed = SimpleNamespace(
             returncode=0,

packages/browseros/resources/BROWSEROS_VERSION

@@ -1,4 +1,4 @@
 BROWSEROS_MAJOR=0
 BROWSEROS_MINOR=50
 BROWSEROS_BUILD=0
-BROWSEROS_PATCH=2
+BROWSEROS_PATCH=3