chown build outputs even if build fails

[emersonknapp]

Fixes #153 Depends on #276

Use an exit hook in the bash building script to make sure that everything in the workspace is owned by the calling user, rather than by root. Add a test that fails before the change

[codecov[bot]]

Codecov Report

Merging #275 (475d7b4) into master (5efbbed) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #275   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files          10       10           
  Lines         404      404           
=======================================
  Hits          372      372           
  Misses         32       32           

Flag	Coverage Δ
unittests	92.07% <ø> (ø)

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[emersonknapp]

@zmichaels11 almost all of the change is testing framework - I am introducing a pytest-based test for building, which didn't exist previously, so that looks like a lot of test code.

Adding this new test type highlighted that the "docker-in-docker" builds that we had been doing for the pytests were not able to do emulation, whereas the setup that "e2e" was using could do qemu emulation just fine - so I consolidated the setup between the two - I am going to move in the direction of removing that e2e script and making it all into python-based tests instead of an unwieldy bash script

[emersonknapp]

Ok - talked myself out of this larger PR, https://github.com/ros-tooling/cross_compile/pull/276 will come first and enable this, making the actual bugfix a lot more obvious