fix: use feature/multi-tenancy branch for backend (has critical fixes)

Author: leifj

.github/workflows/e2e-tests.yml

@@ -85,7 +85,7 @@ on:
       backend-ref:
         description: 'Backend ref (branch/tag/SHA)'
         type: string
-        default: 'main'
+        default: 'feature/multi-tenancy'
       frontend-repo:
         description: 'Frontend repository URL'
         type: string

.github/workflows/self-test.yml

@@ -13,4 +13,4 @@ jobs:
     uses: ./.github/workflows/e2e-tests.yml
     with:
       frontend-ref: 'master'
-      backend-ref: 'main'
+      backend-ref: 'feature/multi-tenancy'