Add pull_request trigger for game tests

Author: Ocelot5836

.github/workflows/gametests.yml

@@ -9,6 +9,9 @@ on:
       - '**/settings.gradle'
       - '**/build.gradle'
       - '.github/workflows/gametests.yml'
+  pull_request:
+    branches:
+      - 'main'
 
 jobs:
   build:
@@ -34,4 +37,4 @@ jobs:
         run: ./gradlew build
 
       - name: Run game tests
-        run: ./gradlew neoforge:runGameTest
+        run: ./gradlew neoforge:runGameTest