ci(ovn): improve stability (#945)

diff --git a/build/pin-images.py b/build/pin-images.py
index 83ae2d4..361db9c 100755
--- a/build/pin-images.py
+++ b/build/pin-images.py
@@ -134,6 +134,14 @@
     for image in data["_atmosphere_images"]:
         if image in SKIP_IMAGE_LIST:
             continue
+
+        # NOTE(mnaser): If we're in CI, only pin the Atmosphere images
+        if (
+            "registry.atmosphere.dev" in registry
+            and "ghcr.io/vexxhost/atmosphere" not in data["_atmosphere_images"][image]
+        ):
+            continue
+
         image_src = data["_atmosphere_images"][image].replace(
             "ghcr.io/vexxhost/atmosphere", registry
         )