Use pull_request triggers primarily for workflows

Instead of relying on push triggers in general, we now use pull_request
and reserve push triggers for main and release branches.

This makes the behaviour more consistent for users contributing from
repository forks. However, we no longer have a quick-feedback loop
for development.

.github/workflows/ci-integ-test.yml

@@ -2,7 +2,12 @@ name: CI-integ-test
 
 on:
   workflow_dispatch:
+  pull_request:
   push:
+    branches:
+    - 'main'
+    - 'release/**'
+    - 'dev/**' # Allow running tests on dev branches without a PR
 
 jobs:
   determine-suite:
@@ -11,35 +16,27 @@ jobs:
       runner-os: ${{ steps.determine-suite.outputs.suite == 'quick' && '["ubuntu-latest"]' || '["ubuntu-latest", "windows-latest", "macos-latest"]' }}
       cache-key-prefix: ${{ steps.determine-suite.outputs.suite == 'quick' && '0' || github.run_number }}
     steps:
-    - name: Get current PR details
-      uses: 8BitJonny/gh-get-current-pr@3.0.0
-      id: PR
     - name: Determine suite to run
       id: determine-suite
       run: |
         # Always run quick suite if we are not in the core `gradle/actions` repository
-        # This reduces the load for developers working on forks
+        # This reduces the load for developers working on 'main' on forks
         if [ "${{ github.repository }}" != "gradle/actions" ]; then
           echo "Not in core repository: suite=quick"
           echo "suite=quick" >> "$GITHUB_OUTPUT"
           exit 0
         fi
 
-        # Always run quick suite for dependabot PRs
-        if [ "${{ github.actor }}" == "dependabot[bot]" ]; then
-          echo "Dependabot: suite=quick"
-          echo "suite=quick" >> "$GITHUB_OUTPUT"
+        # Run full suite for push trigger on 'main' and 'release/*' branches
+        if [[ "${{ github.ref_name }}" == "main" || "${{ github.ref_name }}" == "release/"* ]]; then
+          echo "Push to main branch: suite=full"
+          echo "suite=full" >> "$GITHUB_OUTPUT"
           exit 0
         fi
 
-        # Run full suite for PRs
-        if [ "${{ steps.PR.outputs.pr_found }}" == "false" ]; then
-          echo "PR not found: suite=quick"
-          echo "suite=quick" >> "$GITHUB_OUTPUT"
-        else
-          echo "PR found: suite=full"
-          echo "suite=full" >> "$GITHUB_OUTPUT"
-        fi
+        # Run quick suite for everything else
+        echo "Everything else: suite=quick"
+        echo "suite=quick" >> "$GITHUB_OUTPUT"
 
   build-distribution:
     runs-on: ubuntu-latest