ci: run lint on CI

.github/workflows/lint.yaml

@@ -1,17 +1,16 @@
 name: Run lint checks
 
-on:
-  push:
+on: [push, pull_request]
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    container: thyrlian/android-sdk:latest
     steps:
       - name: Check out repository
         uses: actions/checkout@v2
 
       - name: Run detekt
         run: |
           cd SimpleLogin/
-          ./gradlew detekt || true
+          ./gradlew detekt