fix: allow TimeoutMinutes to be expression

[catthehacker]

fixes #1216

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	0.93s
✅ EDITORCONFIG	editorconfig-checker	1		0	0.01s
✅ GIT	git_diff	yes		no	0.0s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[codecov]

Codecov Report

Merging #1217 (127a47c) into master (4f8da0a) will increase coverage by 4.67%.
The diff coverage is 76.73%.

@@            Coverage Diff             @@
##           master    #1217      +/-   ##
==========================================
+ Coverage   57.50%   62.18%   +4.67%     
==========================================
  Files          32       40       +8     
  Lines        4594     5345     +751     
==========================================
+ Hits         2642     3324     +682     
- Misses       1729     1760      +31     
- Partials      223      261      +38     

Impacted Files	Coverage Δ
pkg/container/docker_pull.go	33.33% <0.00%> (ø)
pkg/model/action.go	0.00% <0.00%> (ø)
pkg/model/github_context.go	79.51% <ø> (ø)
pkg/model/step_result.go	0.00% <ø> (ø)
pkg/model/workflow.go	54.29% <0.00%> (+3.38%)	⬆️
pkg/container/docker_run.go	15.18% <22.52%> (+9.64%)	⬆️
pkg/common/git/git.go	49.66% <40.00%> (ø)
pkg/container/file_collector.go	44.85% <44.85%> (ø)
pkg/exprparser/interpreter.go	73.37% <53.48%> (-0.02%)	⬇️
pkg/model/planner.go	50.73% <60.00%> (+0.32%)	⬆️
... and 27 more

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