ci: dynamic submodule check for build_release (#1114)

* ci: dynamic submodule check for build_release

* test opendbc diff

* somem fix

* this way

* use path

* use master branch instead

* less verbose

* test bump

* test 1 more sub change

* unbump

* only echo if there's a diff

.github/workflows/selfdrive_tests.yaml

@@ -67,7 +67,23 @@ jobs:
     - name: Check submodules
       if: github.repository == 'sunnypilot/sunnypilot'
       timeout-minutes: 3
-      run: release/check-submodules.sh
+      run: |
+        if [ "${{ github.ref }}" != "refs/heads/master" ]; then
+          git fetch  origin master:refs/remotes/origin/master
+
+          SUBMODULE_PATHS=$(git diff origin/master HEAD --name-only | grep -E '^[^/]+$' | while read path; do
+            if git ls-files --stage "$path" | grep -q "^160000"; then
+              echo "$path"
+            fi
+          done | tr '\n' ' ')
+
+          if [ -n "$SUBMODULE_PATHS" ]; then
+            echo "Changed submodule paths: $SUBMODULE_PATHS"
+            export SUBMODULE_PATHS="$SUBMODULE_PATHS"
+            export CHECK_PR_REFS=true
+          fi
+        fi
+        release/check-submodules.sh
 
   build:
     runs-on: ${{