check: Run Android linter in android suite

Author: gnprice

android/app/build.gradle

@@ -72,6 +72,13 @@ android {
                     signingConfigs.release : signingConfigs.debug
         }
     }
+
+    lint {
+        // For docs on options available here:
+        //   https://developer.android.com/reference/tools/gradle-api/8.5/com/android/build/api/dsl/Lint
+        checkAllWarnings = true
+        warningsAsErrors = true
+    }
 }
 
 tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {

tools/check

@@ -362,6 +362,15 @@ run_android() {
     files_check android/ \
     || return 0
 
+    # This causes `android/gradlew` to exist, for `tools/gradle` to use.
+    flutter build apk --config-only \
+    || return
+
+    # For docs on this Android linter:
+    #   https://developer.android.com/studio/write/lint
+    tools/gradle -q :app:lint \
+    || return
+
     flutter build apk \
     || return