Composite action

[jsoref]

fixes #607

[codecov]

Codecov Report

Merging #608 (969acef) into master (cec6348) will increase coverage by 0.04%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master     #608      +/-   ##
==========================================
+ Coverage   49.57%   49.62%   +0.04%     
==========================================
  Files          23       23              
  Lines        2374     2380       +6     
==========================================
+ Hits         1177     1181       +4     
- Misses       1071     1072       +1     
- Partials      126      127       +1     

Impacted Files	Coverage Δ
pkg/runner/step_context.go	70.86% <53.84%> (-0.07%)	⬇️

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[cplee]

@jsoref - i could use your help resolving the conflict, then ready to merge