fix: Add correct path for release-unsigned.apk according to buildtype (fossasia#2360)

Author: ParthivMangukiya

apk-generator/v2/scripts/build_apk.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 ./gradlew assemble$2Release --info
 echo "signing"
-jarsigner -keystore ${KEYSTORE_PATH} -storepass ${KEYSTORE_PASSWORD} app/build/outputs/apk/app-$2-release-unsigned.apk ${KEY_ALIAS}
+jarsigner -keystore ${KEYSTORE_PATH} -storepass ${KEYSTORE_PASSWORD} app/build/outputs/apk/$2/release/app-$2-release-unsigned.apk ${KEY_ALIAS}
 echo "zipaligning"
-${1}/zipalign -v 4 app/build/outputs/apk/app-$2-release-unsigned.apk release.apk
+${1}/zipalign -v 4 app/build/outputs/apk/$2/release/app-$2-release-unsigned.apk release.apk
 echo "done"