fix: record proper step state on build timeout

[wass3r]

fixes go-vela/community#119

for affected containers, sets step state properly on build timeout or other error before it takes a snapshot, on timeout it marks container with exit code 137 and sets error message, on other error it uses generic exit code 1.

before:

after:

was really tempted to also update build error message to be clearer, but saving it for a different PR.

[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.92%. Comparing base (5b043e9) to head (44d11dd).

Files with missing lines	Patch %	Lines
mock/docker/container.go	0.00%	6 Missing ⚠️
executor/linux/step.go	86.95%	2 Missing and 1 partial ⚠️
executor/local/step.go	86.95%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #666      +/-   ##
==========================================
+ Coverage   52.62%   52.92%   +0.30%     
==========================================
  Files         124      124              
  Lines        5361     5413      +52     
==========================================
+ Hits         2821     2865      +44     
- Misses       2320     2328       +8     
  Partials      220      220              

Files with missing lines	Coverage Δ
executor/linux/step.go	76.07% <86.95%> (+2.42%)	⬆️
executor/local/step.go	90.90% <86.95%> (+1.43%)	⬆️
mock/docker/container.go	0.00% <0.00%> (ø)

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