Run all tests if gradle file is changed (#3006)

The tests are run using the `test-with-test-runner` script so that they are run with the Docker test runner. This ensures that changes to Gradle are tested in the test runner environment.

Author: jagdish-15

.github/workflows/java.yml

@@ -55,7 +55,7 @@ jobs:
         if: failure()
 
   test-changed:
-    name: Test changed exercises using java-test-runner
+    name: Test changed exercises using gradlew
     if: github.event_name == 'pull_request'
     runs-on: ubuntu-24.04
     steps:

bin/test-changed-exercise

@@ -13,9 +13,16 @@ MERGE_BASE=$(git merge-base HEAD origin/"$BASE_BRANCH")
 # Get changed files relative to merge base
 changed_files=$(git diff --name-only "$MERGE_BASE" HEAD)
 
+# If any Gradle build file changed, run the full suite and exit
+if echo "$changed_files" | grep -qE '\.(gradle|gradlew|bat)$|settings\.gradle'; then
+  echo "Gradle build files changed, running full test suite..."
+  ./bin/test-with-test-runner
+  exit 0
+fi
+
 # Extract unique exercise directories
 changed_exercises=$(echo "$changed_files" | \
-  grep -E '^exercises/(practice|concept)/[^/]+/.+\.(java|gradle)$' | \
+  grep -E '^exercises/(practice|concept)/[^/]+/.+\.java$' | \
   cut -d/ -f1-3 | sort -u)
 
 if [ -z "$changed_exercises" ]; then