Expand environment variables in tasks.cwd

[daxpedda]

This is potentially a breaking change, I marked it as such in the changelog.

Fixes #317.

[codecov-io]

Codecov Report

Merging #318 into 0.24.0 will increase coverage by 0.8%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           0.24.0     #318     +/-   ##
=========================================
+ Coverage   92.32%   93.13%   +0.8%     
=========================================
  Files          86       86             
  Lines       15388    14959    -429     
=========================================
- Hits        14207    13932    -275     
+ Misses       1181     1027    -154

Impacted Files	Coverage Δ
src/lib/runner.rs	92.74% <100%> (ø)	⬆️
src/lib/cli_commands/diff_steps_test.rs	89.85% <0%> (-0.94%)	⬇️
src/lib/cli_commands/print_steps_test.rs	92.15% <0%> (-0.3%)	⬇️
src/lib/runner_test.rs	90.1% <0%> (-0.27%)	⬇️
src/lib/execution_plan_test.rs	95.11% <0%> (-0.2%)	⬇️
src/lib/condition_test.rs	92.7% <0%> (-0.1%)	⬇️
src/lib/environment/mod.rs	96.39% <0%> (-0.09%)	⬇️
src/lib/types_test.rs	95.66% <0%> (-0.07%)	⬇️
src/lib/types.rs	86.2% <0%> (+0.25%)	⬆️
... and 8 more

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[sagiegurari]

thanks. this makes a lot of sense.

[sagiegurari]

looks great. merging. thanks a lot