Factor FOSSA out into a separate action (#4894)

Author: chadwhitacre

.github/workflows/enforce-license-compliance.yml

@@ -8,31 +8,7 @@ on:
 
 jobs:
   enforce-license-compliance:
-    if: github.repository_owner == 'getsentry'
     runs-on: ubuntu-latest
     steps:
-      - name: 'Fetch FOSSA_API_KEY'
-        id: fetch_key
-        run: |
-
-          # We can't use GitHub Secrets for this key because we want it to be
-          # available in forks. This is a push-only key for a low-privilege
-          # account, so it is safe (enough) to expose publicly. This is a hack
-          # to set it in one place in case we ever do need to roll it. 🤷
-
-          curl -O https://raw.githubusercontent.com/getsentry/.github/main/.github/workflows/FOSSA_API_KEY
-          echo "::set-output name=key::$(cat FOSSA_API_KEY | grep -v '#')"
-
-      - name: 'Checkout Code'
-        uses: actions/checkout@v2
-
-      - name: 'Run FOSSA Scan'
-        uses: fossas/[email protected]
-        with:
-          api-key: ${{ steps.fetch_key.outputs.key }}
-
-      - name: 'Run FOSSA Test'
-        uses: fossas/[email protected]
-        with:
-          api-key: ${{ steps.fetch_key.outputs.key }}
-          run-tests: true
+      - name: 'Enforce License Compliance'
+        uses: getsentry/action-enforce-license-compliance@main