Add ignore_image_cache config

modal/config.py

@@ -218,6 +218,7 @@ class _Setting(typing.NamedTuple):
     "worker_id": _Setting(),  # For internal debugging use.
     "restore_state_path": _Setting("/__modal/restore-state.json"),
     "force_build": _Setting(False, transform=_to_boolean),
+    "ignore_image_cache": _Setting(False, transform=_to_boolean),
     "traceback": _Setting(False, transform=_to_boolean),
     "image_builder_version": _Setting(),
     "strict_parameters": _Setting(False, transform=_to_boolean),  # For internal/experimental use

modal/image.py

@@ -622,6 +622,7 @@ async def _load(self: _Image, resolver: Resolver, existing_object_id: Optional[s
                 # Failsafe mechanism to prevent inadvertant updates to the global images.
                 # Only admins can publish to the global namespace, but they have to additionally request it.
                 allow_global_deployment=os.environ.get("MODAL_IMAGE_ALLOW_GLOBAL_DEPLOYMENT", "0") == "1",
+                ignore_cache=config.get("ignore_image_cache"),
             )
             resp = await retry_transient_errors(resolver.client.stub.ImageGetOrCreate, req)
             image_id = resp.image_id

modal_proto/api.proto

@@ -1790,6 +1790,9 @@ message ImageGetOrCreateRequest {
   string builder_version = 9;
   // Only admins can publish global images, but this provides an extra failsafe
   bool allow_global_deployment = 10;
+  // Include the App ID and version in the image cache key,
+  // which has the effect of making it look like the cache is being ignored during the build phase
+  bool ignore_cache = 11;
 }
 
 message ImageGetOrCreateResponse {