fix: make dev tools executable

tests/test_development.py

@@ -61,6 +61,19 @@ async def test_supplied_script_names_use_the_same_directory(tmp_path) -> None:
     assert (workspace / "selected").read_text() == "python\n"
 
 
+async def test_runs_non_executable_shell_script_from_bind_mount(tmp_path) -> None:
+    workspace = tmp_path / "workspace"
+    workspace.mkdir()
+    development = environment(tmp_path, ["mounted"])
+    mounted = development.scripts_dir / "mounted"
+    mounted.write_text("#!/bin/sh\nprintf 'mounted\\n' > selected\n")
+    mounted.chmod(0o644)
+
+    await development.prepare(workspace)
+
+    assert (workspace / "selected").read_text() == "mounted\n"
+
+
 async def test_reports_script_failure_output(tmp_path) -> None:
     workspace = tmp_path / "workspace"
     workspace.mkdir()