Fix/relative temp dir

[rcannood]

• viash test: Fix issue where VIASH_TEMP could not be a relative directory when running viash test (VIASH_TEMP must be absolute #242).

Fyi @Grifs, the problem was that if VIASH_TEMP is a relative directory, then running Process(cmd, cwd = buildDir.toFile) where cmd is a Viash executable will cause all sorts of funny business. The solution was to create a new temporary directory within the temporary directory that's being used for a viash test, and to provide the new tempdir to the process with Process(cmd, cwd = buildDir.toFile, "VIASH_TEMP" -> newDir).

[rcannood]

Oops, must have rebased and then forgotten about it.

[codecov]

Codecov Report

Base: 84.71% // Head: 84.75% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (07189f4) compared to base (7d3c1f7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #244      +/-   ##
===========================================
+ Coverage    84.71%   84.75%   +0.04%     
===========================================
  Files           85       85              
  Lines         2905     2913       +8     
  Branches       176      172       -4     
===========================================
+ Hits          2461     2469       +8     
  Misses         444      444              

Impacted Files	Coverage Δ
...main/scala/io/viash/platforms/DockerPlatform.scala	97.10% <ø> (ø)
src/main/scala/io/viash/ViashTest.scala	96.85% <100.00%> (+0.21%)	⬆️
src/main/scala/io/viash/helpers/IO.scala	88.52% <100.00%> (ø)

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