Add catalyst (#7192)

* Restores ML Pods after M77.

* Fix Package.swift

* Re-add catalyst to GHA workflow.

* Run catalyst tests and temporarily enable spm-cron to run now.

* Add scheme for catalyst test.

* Re-enable spm-cron to run on schedule.

Author: manjanac

.github/workflows/mlmodeldownloader.yml

@@ -52,8 +52,7 @@ jobs:
     runs-on: macOS-latest
     strategy:
       matrix:
-        # TODO: manjanac@ Add catalyst back here.
-        target: [tvOS, macOS]
+        target: [tvOS, macOS, catalyst]
     steps:
     - uses: actions/checkout@v2
     - name: Xcode 12
@@ -65,16 +64,14 @@ jobs:
 
   catalyst:
     # Don't run on private repo unless it is a PR.
-    # TODO: manjanac@ Uncomment line below to re-enable catalyst.
-    # if: github.repository != 'FirebasePrivate/firebase-ios-sdk' || github.event_name == 'pull_request'
-    if: false
+    if: github.repository != 'FirebasePrivate/firebase-ios-sdk' || github.event_name == 'pull_request'
     runs-on: macOS-latest
     steps:
     - uses: actions/checkout@v2
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Setup project and Build Catalyst
-      run: scripts/test_catalyst.sh FirebaseMLModelDownloader build
+      run: scripts/test_catalyst.sh FirebaseMLModelDownloader test FirebaseMLModelDownloader-Unit-unit
 
   mlmodeldownloader-cron-only:
     # Don't run on private repo.