Initialize app at runtime instead of import time (#4024)

skyvern/forge/__init__.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+import typing
+from typing import Any
+
+if typing.TYPE_CHECKING:
+    from skyvern.forge.forge_app import ForgeApp
+
+
+class AppHolder:
+    def __init__(self) -> None:
+        object.__setattr__(self, "_inst", None)
+
+    def set_app(self, inst: ForgeApp) -> None:
+        object.__setattr__(self, "_inst", inst)
+
+    def __getattr__(self, name: str) -> Any:
+        inst = object.__getattribute__(self, "_inst")
+        if inst is None:
+            raise RuntimeError("ForgeApp is not initialized, start_forge_app should be called")
+
+        return getattr(inst, name)
+
+    def __setattr__(self, name: str, value: Any) -> None:
+        inst = object.__getattribute__(self, "_inst")
+        if inst is None:
+            raise RuntimeError("ForgeApp is not initialized, start_forge_app should be called")
+
+        setattr(inst, name, value)
+
+
+if typing.TYPE_CHECKING:
+    app: ForgeApp
+else:
+    app = AppHolder()  # type: ignore
+
+
+def set_force_app_instance(inst: ForgeApp) -> None:
+    app.set_app(inst)  # type: ignore