fix: align runner.os / runner.arch to known values

[ChristopherHX]

This change now also unifies RUNNER_OS with runner.os, I suggest to do the same thing for the github context.

This is a breaking change for github-act-runner, but we should align to actions/runner where possible

Fixes #1509

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	2		0	0.02s
✅ REPOSITORY	gitleaks	yes		no	2.48s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ REPOSITORY	secretlint	yes		no	0.98s

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[codecov[bot]]

Codecov Report

Merging #1510 (0545c82) into master (4f8da0a) will increase coverage by 3.71%. The diff coverage is 67.39%.

@@            Coverage Diff             @@
##           master    #1510      +/-   ##
==========================================
+ Coverage   57.50%   61.22%   +3.71%     
==========================================
  Files          32       46      +14     
  Lines        4594     7141    +2547     
==========================================
+ Hits         2642     4372    +1730     
- Misses       1729     2462     +733     
- Partials      223      307      +84     

Impacted Files	Coverage Δ
pkg/common/file.go	0.00% <0.00%> (ø)
pkg/container/docker_logger.go	52.08% <ø> (ø)
pkg/container/host_environment.go	0.00% <0.00%> (ø)
pkg/container/parse_env_file.go	0.00% <0.00%> (ø)
pkg/container/util.go	0.00% <0.00%> (ø)
pkg/model/action.go	0.00% <0.00%> (ø)
pkg/container/docker_run.go	13.58% <11.48%> (+8.04%)	:arrow_up:
pkg/model/workflow.go	42.11% <18.51%> (-8.80%)	:arrow_down:
...ontainer/linux_container_environment_extensions.go	24.32% <24.32%> (ø)
pkg/container/docker_pull.go	33.33% <33.33%> (ø)
... and 38 more

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[mergify[bot]]

@ChristopherHX this pull request has failed checks 🛠