Do not trigger GHA workflows on forks

GHA workflows are automatically executed on forks where they fail.
This change prevents this (only for those workflows that are
automatically triggered, e.g.: on push or schedule).

.github/workflows/continuous-integration.yml

@@ -8,6 +8,7 @@ jobs:
   build:
     name: Build branch
     runs-on: ubuntu-latest
+    if: ${{ github.repository_owner == 'spring-projects' }}
     services:
       ollama:
         image: ollama/ollama:latest