Disable cron jobs and private SSH key jobs in forks (#6821)

* Try disabling cron jobs in forks

* Try fixing quality checks

* Try fixing tests and enterprise builds

* Stop using the ssh private key in more quality checks

* Try disabling codecov if there is no token

.github/workflows/build_enterprise.yml

@@ -19,7 +19,7 @@ jobs:
     name: Build Enterprise APKs
     runs-on: ubuntu-latest
     # Skip in forks
-    if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == 'element-hq/element-x-android' }}
+    if: ${{ github.event.repository.fork != true }}
     strategy:
       matrix:
         variant: [debug, release, nightly]