* source bashrc with entrypoint script since many a times it's possible
a non-interactive shell is spun up and asdf+gradle niceties just
wouldn't get loaded
* in alpine, ash is the default shell, this commit changes that
* add gradle via asdf. this speeds up build times as this image is being
used in ci and now that gradle is a part of the package, it doesn't
have to be downloaded at the beginning of each pipeline running
'./gradlew ...'
