device_posture_rule: add input fields for linux OS

[jacobbednarz]

Needed for cloudflare/terraform-provider-cloudflare#1842

[codecov-commenter]

Codecov Report

Merging #1087 (7ca49f6) into master (e39278e) will increase coverage by 0.12%.
The diff coverage is 68.29%.

@@            Coverage Diff             @@
##           master    #1087      +/-   ##
==========================================
+ Coverage   49.94%   50.07%   +0.12%     
==========================================
  Files         115      117       +2     
  Lines       10991    11090      +99     
==========================================
+ Hits         5490     5553      +63     
- Misses       4338     4362      +24     
- Partials     1163     1175      +12     

Impacted Files	Coverage Δ
device_posture_rule.go	61.80% <ø> (ø)
pages_project.go	50.81% <ø> (ø)
stream.go	64.91% <ø> (ø)
teams_accounts.go	53.84% <ø> (ø)
teams_devices.go	52.63% <ø> (ø)
access_service_tokens.go	66.29% <53.84%> (-2.13%)	⬇️
api_shield.go	53.84% <53.84%> (ø)
url_normalization_settings.go	53.84% <53.84%> (ø)
workers.go	69.38% <72.72%> (-0.04%)	⬇️
cloudflare.go	68.61% <86.95%> (+1.41%)	⬆️
... and 6 more

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[github-actions]

changelog detected ✅

[github-actions]

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