feat: add install script packaging

tests/unit/test_compose.py

@@ -304,6 +304,19 @@ class TestSidecarBundleShape(unittest.TestCase):
         self.assertEqual("bot-bottle-sidecars:latest", sc["image"])
         self.assertEqual("Dockerfile.sidecars", sc["build"]["dockerfile"])
 
+    def test_bundle_uses_packaged_dockerfile_when_root_missing(self):
+        from bot_bottle.backend.docker import compose as compose_mod
+
+        original = compose_mod._REPO_DIR
+        try:
+            compose_mod._REPO_DIR = "/tmp/does-not-exist"
+            self.assertEqual(
+                "bot_bottle/Dockerfile.sidecars",
+                compose_mod._sidecar_bundle_dockerfile(),
+            )
+        finally:
+            compose_mod._REPO_DIR = original
+
     def test_bundle_container_name_uses_sidecars_prefix(self):
         sc = self._render()["services"]["sidecars"]
         self.assertEqual(f"bot-bottle-sidecars-{SLUG}", sc["container_name"])