Docker: get binary tar file and extract to /usr/local/bin

Dockerfile: check location of cljstyle

style: full path to cljstyle

Docker: install git for checkstyle install

Docker: install and use curl for cljstyle install

Docker: use pipe rather than &&

Docker: call scripts using sh

Docker: make cljstyle install script executable

Docker: explicit call to cljstyle install script

Docker: update cljstyle install script options

Docker: alpine image

initial action definition