enable v2+v3 APK signing so the release key carries a rotation lineage

@@ -39,6 +39,12 @@3939                 keyAlias props.getProperty("peachKeyAlias")4040                 keyPassword props.getProperty("peachKeyPassword")4141             }42+            // v3 is the only escape hatch from "this key is forever": it carries a43+            // rotation lineage, so a future key can be proven to descend from this44+            // one instead of forcing every tester to uninstall and lose their45+            // vault. AGP leaves it off unless asked.46+            enableV2Signing true47+            enableV3Signing true4248         }4349     }4450