build: create tmp project outside of app directory

- Otherwise it creates app's apk and not apk from
the tmp project

Dockerfile

@@ -106,7 +106,7 @@ RUN	bash /tmp/$NODE_SETUP_SCRIPT && apt-get install -y nodejs && \
   npm install -g @ionic/cli@$IONIC_VERSION cordova@$CORDOVA_VERSION cordova-res@$CORDOVA_RES_VERSION
 
 ### Create, build, delete an empty cordova project to download necessary maven files and keep them in image
-RUN	cordova create tmp-project && \
+RUN	cd / && cordova create tmp-project && \
   cd tmp-project && \
   cordova platform add android && \
   cordova build && \