only perform chown operation for non root users

[johnfoconnor]

as discussed in #1202 (comment)

[codecov]

Codecov Report

Merging #1250 (1ea49e0) into master (4f8da0a) will increase coverage by 3.97%.
The diff coverage is 74.16%.

@@            Coverage Diff             @@
##           master    #1250      +/-   ##
==========================================
+ Coverage   57.50%   61.48%   +3.97%     
==========================================
  Files          32       40       +8     
  Lines        4594     5492     +898     
==========================================
+ Hits         2642     3377     +735     
- Misses       1729     1845     +116     
- Partials      223      270      +47     

Impacted Files	Coverage Δ
pkg/model/action.go	0.00% <0.00%> (ø)
pkg/model/step_result.go	0.00% <ø> (ø)
pkg/container/docker_run.go	14.03% <16.07%> (+8.49%)	⬆️
pkg/container/docker_pull.go	33.33% <33.33%> (ø)
pkg/container/file_collector.go	45.87% <45.87%> (ø)
pkg/common/git/git.go	50.00% <47.91%> (ø)
pkg/container/docker_auth.go	47.61% <50.00%> (+2.61%)	⬆️
pkg/model/workflow.go	54.32% <50.00%> (+3.40%)	⬆️
pkg/exprparser/interpreter.go	73.37% <53.48%> (-0.02%)	⬇️
pkg/model/planner.go	50.73% <60.00%> (+0.32%)	⬆️
... and 30 more

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