Run PHPUnit - #46

DL3009 info: Delete the apt-get lists after installing something

DL3008 warning: Pin versions in apt get install. Instead of `apt-get install <package>` use `apt-get install <package>=<version>`

DL3027 warning: Do not use apt as it is meant to be a end-user tool, use apt-get or apt-cache instead

DL3059 info: Multiple consecutive `RUN` instructions. Consider consolidation.

DL3015 info: Avoid additional packages by specifying `--no-install-recommends`

DL4001 warning: Either use Wget or Curl but not both

DL3047 info: Avoid use of wget without progress bar. Use `wget --progress=dot:giga <url>`.Or consider using `-q` or `-nv` (shorthands for `--quiet` or `--no-verbose`).

DL3015 info: Avoid additional packages by specifying `--no-install-recommends`