Phing runs under user with limited permission

Question

I have not used phing before, but would like to use it to automate my deployment process. Currently I log in under myuser, Apache runs under www-data. All my application code is owned by myuser, but other (cache) files are generated by www-data.

I currently solve this by using sudo to remove these files. I would like to keep the application code owned by myuser, because it's easier to access the files via ssh. I wouldn't like phing to run with super powers, because at this moment I don't trust this automated tool yet.

What is the best practice to use phing with limited file permissions?