worflows: activity retry policy

[famarting]

Description

first part of #541

also updated one of the existing examples to show how activity retry policies can be used

Issue reference

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.38%. Comparing base (6c59092) to head (a30f3a3).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
workflow/context.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
- Coverage   62.52%   62.38%   -0.14%     
==========================================
  Files          56       56              
  Lines        4139     4201      +62     
==========================================
+ Hits         2588     2621      +33     
- Misses       1425     1453      +28     
- Partials      126      127       +1     

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[cicoyle]

lgtm

[mikeee]

Looks like a solid implementation of retry policies for activities, just one potential signature refactor to accommodate the future addition of workflow retry policies. Also an ask - would it be possible to implement a simple activity that does continually fail - to test the retry logic?

[famarting]

good to go

[famarting]

can we merge?

[mikeee]

Can you please add a test for the activity to retry - I think it's crucial to validate this so we have some visibility if it breaks

[mikeee]

Thanks for adding tests, just need to register the new activity

[mikeee]

lgtm