ci: Tune license checks on fork repositories (#20700)

.github/workflows/fossa.yml

@@ -13,12 +13,6 @@ jobs:
     env:
       FOSSA_API_KEY: ${{secrets.FOSSA_API_KEY}}
     steps:
-      - name: Ignore forks
-        run: |
-          if [ -z "$FOSSA_API_KEY" ]; then
-            echo "FOSSA_API_KEY is empty. Is the job running in a forked repository?"
-            exit 0
-          fi
       - uses: actions/checkout@v4
         with:
           ref: master
@@ -29,5 +23,9 @@ jobs:
           curl -H 'Cache-Control: no-cache' https://raw.githubusercontent.com/fossas/fossa-cli/master/install-latest.sh | bash
       - name: Run FOSSA analysis
         run: |
-          fossa analyze
-          fossa test
+          if [ -n "$FOSSA_API_KEY" ]; then
+            fossa analyze
+            fossa test
+          else
+            echo "License checks did not run. FOSSA_API_KEY is not defined for this fork."
+          fi