another try

Author: paulb777

.github/workflows/common.yml

@@ -52,6 +52,12 @@ on:
         required: false
         default: ""
 
+      # An environment variable to be set for the test run.
+      env_var:
+        type: string
+        required: false
+        default: ""
+
     outputs:
       cache_key:
         description: "The cache key for the Swift package resolution."
@@ -99,6 +105,8 @@ jobs:
             xcode: Xcode_26.1
             platform: iOS
     runs-on: ${{ matrix.os }}
+    env:
+      ${{ inputs.env_var }}: 1
     steps:
     - uses: actions/checkout@v4
     - uses: actions/cache/restore@v4

.github/workflows/crashlytics.yml

@@ -28,11 +28,10 @@ concurrency:
 jobs:
   spm:
     env:
-      # Don't run flaky tests in nightlies
-      CRASHLYTICS_NIGHTLY: 1
     uses: ./.github/workflows/common.yml
     with:
       target: FirebaseCrashlyticsUnit
+      env_var: ${{ github.event_name == 'schedule' && 'CRASHLYTICS_NIGHTLY' || '' }}
 
   catalyst:
     uses: ./.github/workflows/common_catalyst.yml
@@ -97,3 +96,4 @@ jobs:
       product: FirebaseCrashlytics
       platforms: '[ "ios", "tvos", "macos", "watchos --skip-tests" ]'
       flags: '[ "--use-static-frameworks", "--use-modular-headers --skip-tests" ]'
+