[CI] Skip compile job when not on main branch

.github/workflows/test-dev.yml

@@ -10,7 +10,8 @@ concurrency:
 
 jobs:
   compile:
-    name: Compile and cache
+    name: Compile and create build cache (main branch)
+    if: ${{ github.ref == 'refs/heads/main-ose' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -31,6 +32,7 @@ jobs:
 
   test:
     needs: compile
+    if: ${{ always() }}     # even if compile didn't run (because not on main branch)
     name: Tests without emulator
     runs-on: ubuntu-latest
     steps:
@@ -52,6 +54,7 @@ jobs:
   # generates the build caches because it uses more gradle dependencies
   test_on_emulator:
     needs: compile
+    if: ${{ always() }}     # even if compile didn't run (because not on main branch)
     name: Tests with emulator
     runs-on: ubuntu-latest
     steps: