Dockerfile cleanup

[emersonknapp]

• Make sure to clean up apt caches in dockerfile wherever they are used
• move workspace source copying to as late as possible to maximize Docker cache use
• Remove unecessary logic around manually creating rosdistro directories, apt install takes care of it

Signed-off-by: Emerson Knapp emerson.b.knapp@gmail.com

[codecov[bot]]

Codecov Report

Merging #71 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   62.86%   62.86%           
=======================================
  Files           4        4           
  Lines         272      272           
=======================================
  Hits          171      171           
  Misses        101      101

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