Update branch protection: main from beta, beta from development

Enforce that PRs to main can only come from beta or hotfix branches,
and PRs to beta can only come from development or hotfix branches.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rubenvdlinde

.github/workflows/pull-request-from-branch-check.yaml

@@ -1,18 +1,32 @@
-name: Main Branch Protection
+name: Branch Protection
 
 on:
   pull_request:
     branches:
       - main
+      - beta
 
 jobs:
   check-branch:
     runs-on: ubuntu-latest
     steps:
       - name: Check branch
         run: |
-          if [[ ${GITHUB_HEAD_REF} != development ]] && [[ ${GITHUB_HEAD_REF} != documentation ]] && ! [[ ${GITHUB_HEAD_REF} =~ ^hotfix/ ]];
-          then
-            echo "Error: Pull request must come from 'development', 'documentation' or 'hotfix/' branch"
-            exit 1
+          TARGET="${{ github.base_ref }}"
+          SOURCE="${{ github.head_ref }}"
+
+          if [[ "$TARGET" == "main" ]]; then
+            if [[ "$SOURCE" != "beta" ]] && ! [[ "$SOURCE" =~ ^hotfix ]]; then
+              echo "Error: Pull requests to main must come from 'beta' or a branch starting with 'hotfix'"
+              echo "Source branch: $SOURCE"
+              exit 1
+            fi
+          elif [[ "$TARGET" == "beta" ]]; then
+            if [[ "$SOURCE" != "development" ]] && ! [[ "$SOURCE" =~ ^hotfix ]]; then
+              echo "Error: Pull requests to beta must come from 'development' or a branch starting with 'hotfix'"
+              echo "Source branch: $SOURCE"
+              exit 1
+            fi
           fi
+
+          echo "Branch check passed: $SOURCE -> $TARGET"