remove debug signing

Author: akliuxingyuan

app/build.gradle

@@ -118,9 +118,10 @@ android {
 
 	// If building locally, just use debug signing. In official automation builds, the
 	// files are signed using a separate service and not within gradle.
-        if (!gradle.mozconfig.substs.MOZ_AUTOMATION) {
-            signingConfig = signingConfigs.debug
-        }
+        // use iceraven CI signing instead
+        // if (!gradle.mozconfig.substs.MOZ_AUTOMATION) {
+        //     signingConfig = signingConfigs.debug
+        // }
 
         if (gradle.hasProperty("localProperties.debuggable") ||
             gradle.mozconfig.substs.MOZ_ANDROID_DEBUGGABLE) {