Only run prerequisites job if on upstream repo

.github/workflows/continuous-integration-workflow.yml

@@ -18,7 +18,6 @@ env:
   STRUCTURE101_LICENSEID: ${{ secrets.STRUCTURE101_LICENSEID }}
   ARTIFACTORY_USERNAME: ${{ secrets.ARTIFACTORY_USERNAME }}
   ARTIFACTORY_PASSWORD: ${{ secrets.ARTIFACTORY_PASSWORD }}
-  RUN_JOBS: ${{ github.repository == 'spring-projects/spring-security' }}
 
 permissions:
   contents: read
@@ -27,6 +26,7 @@ jobs:
   prerequisites:
     name: Pre-requisites for building
     runs-on: ubuntu-latest
+    if: ${{ github.repository == 'spring-projects/spring-security' }}
     outputs:
       runjobs: ${{ steps.continue.outputs.runjobs }}
       project_version: ${{ steps.continue.outputs.project_version }}
@@ -34,7 +34,6 @@ jobs:
       - uses: actions/checkout@v2
       - id: continue
         name: Determine if should continue
-        if: env.RUN_JOBS == 'true'
         run: |
           # Run jobs if in upstream repository
           echo "::set-output name=runjobs::true"