chore: use version code from no of commits

Author: rotieno

.buildsystem/versioning.gradle

@@ -9,7 +9,12 @@
 
 ext.getVersionCode = { ->
     try {
-        return 2
+        def stdout = new ByteArrayOutputStream()
+        exec {
+            commandLine 'git', 'rev-list', '--all', '--count'
+            standardOutput = stdout
+        }
+        return stdout.toString().trim().toInteger()
     }
     catch (ignored) {
         return -1;