Add more tests

[catthehacker]

• add draw_test.go tests
• add dryrun tests
• add tests for environment func
• remove unnecessary loop when reflecting and add default return
• unexport fixIfStatement1 and add better description
• minify workflows in tests and move some of them into one file

[codecov]

Codecov Report

Merging #750 (2e7d07e) into master (0f04942) will increase coverage by 4.67%.
The diff coverage is 61.73%.

@@            Coverage Diff             @@
##           master     #750      +/-   ##
==========================================
+ Coverage   49.27%   53.94%   +4.67%     
==========================================
  Files          23       23              
  Lines        2401     2597     +196     
==========================================
+ Hits         1183     1401     +218     
+ Misses       1090     1057      -33     
- Partials      128      139      +11     

Impacted Files	Coverage Δ
pkg/container/docker_run.go	1.84% <0.00%> (-0.09%)	⬇️
pkg/common/git.go	52.85% <30.15%> (-6.94%)	⬇️
pkg/runner/runner.go	68.96% <33.33%> (-7.51%)	⬇️
pkg/model/planner.go	34.56% <41.37%> (+1.48%)	⬆️
pkg/model/workflow.go	42.77% <50.00%> (+17.06%)	⬆️
pkg/container/docker_pull.go	36.17% <64.70%> (+17.98%)	⬆️
pkg/runner/step_context.go	74.76% <75.81%> (+5.81%)	⬆️
pkg/runner/run_context.go	80.36% <98.55%> (+3.95%)	⬆️
pkg/runner/command.go	90.58% <100.00%> (+2.35%)	⬆️
pkg/runner/expression.go	87.91% <100.00%> (+1.27%)	⬆️
... and 7 more

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[mergify]

@catthehacker this pull request is now in conflict 😩