Prevent execution of Antora jobs on forks

Signed-off-by: Stefano Cordio <[email protected]>

Author: scordio

.github/workflows/update-antora-ui-spring.yml

@@ -12,6 +12,7 @@ permissions:
 
 jobs:
   update-antora-ui-spring:
+    if: ${{ github.repository == 'spring-projects/spring-security' }}
     runs-on: ubuntu-latest
     name: Update on Supported Branches
     strategy:
@@ -25,6 +26,7 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           antora-file-path: 'docs/antora-playbook.yml'
   update-antora-ui-spring-docs-build:
+    if: ${{ github.repository == 'spring-projects/spring-security' }}
     runs-on: ubuntu-latest
     name: Update on docs-build
     steps: