Add file based agent transport

[chrisdoherty4]

This change adds a file based transport that will execute a single workflow. It is useful for testing the agent e2e.

[codecov]

Codecov Report

Merging #763 (d6cee1e) into main (1a0edeb) will decrease coverage by 0.74%.
The diff coverage is 40.00%.

❗ Current head d6cee1e differs from pull request most recent head aaed2e6. Consider uploading reports for the commit aaed2e6 to get more accurate results

@@            Coverage Diff             @@
##             main     #763      +/-   ##
==========================================
- Coverage   51.70%   50.96%   -0.74%     
==========================================
  Files          32       33       +1     
  Lines        1441     1456      +15     
==========================================
- Hits          745      742       -3     
- Misses        655      670      +15     
- Partials       41       44       +3     

Impacted Files	Coverage Δ
internal/agent/transport/file.go	40.00% <40.00%> (ø)

... and 1 file with indirect coverage changes

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[chrisdoherty4]

The previous iteration scanned a directory. However, because the WorkflowHandler does block and there was no tracking of running workflows the implementation would fire all workflows with everything except the first failing.

Given the purpose of this addition is to enable easy e2e testing, I've reduced the implementation to something similar to a suggestion by @jacobweinstock that executes a single file.

[chrisdoherty4]

@Mergifyio queue

[mergify]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at 8ccefc1