fix(skip): surface error when failing to determine whether a container should execute

[ecrupper]

From go-vela/types#327 and go-vela/server#985

Issue: go-vela/community#435

[codecov]

Codecov Report

Merging #524 (4619be7) into main (26628ba) will decrease coverage by 0.17%.
The diff coverage is 40.74%.

@@            Coverage Diff             @@
##             main     #524      +/-   ##
==========================================
- Coverage   83.42%   83.26%   -0.17%     
==========================================
  Files          69       69              
  Lines        5371     5389      +18     
==========================================
+ Hits         4481     4487       +6     
- Misses        746      754       +8     
- Partials      144      148       +4     

Files	Coverage Δ
internal/step/skip.go	100.00% <100.00%> (ø)
executor/linux/build.go	76.65% <20.00%> (-0.41%)	⬇️
executor/linux/stage.go	84.84% <33.33%> (-1.88%)	⬇️
executor/local/build.go	76.68% <20.00%> (-0.71%)	⬇️
executor/local/stage.go	82.05% <33.33%> (-3.09%)	⬇️