fix: install git for durable state recovery

modelhub_submmit_api/state_sync.py

@@ -222,16 +222,23 @@ class StateGitSync:
         return env
 
     def _git(self, *args: str, cwd: Path | None = None, check: bool = True) -> subprocess.CompletedProcess[str]:
-        result = subprocess.run(
-            ["git", *args],
-            cwd=str(cwd or self.project_root),
-            env=self._git_environment(),
-            text=True,
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-            timeout=45,
-            check=False,
-        )
+        try:
+            result = subprocess.run(
+                ["git", *args],
+                cwd=str(cwd or self.project_root),
+                env=self._git_environment(),
+                text=True,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+                timeout=45,
+                check=False,
+            )
+        except FileNotFoundError as exc:
+            raise StateSyncError(
+                "git executable is unavailable; rebuild the service image from the repository Dockerfile"
+            ) from exc
+        except subprocess.TimeoutExpired as exc:
+            raise StateSyncError("git operation timed out after 45 seconds") from exc
         if check and result.returncode != 0:
             reason = _safe_text(result.stderr.strip() or result.stdout.strip() or f"git exited {result.returncode}")
             raise StateSyncError(reason)