display output on docker errors during build

[ddollar]

No description provided.

[codecov]

Codecov Report

Merging #3241 into master will decrease coverage by 0.05%.
The diff coverage is 50%.

@@            Coverage Diff            @@
##           master   #3241      +/-   ##
=========================================
- Coverage   34.96%   34.9%   -0.06%     
=========================================
  Files         130     130              
  Lines       15216   15222       +6     
=========================================
- Hits         5321    5314       -7     
- Misses       8985    8996      +11     
- Partials      910     912       +2

Impacted Files	Coverage Δ
pkg/build/docker.go	61.16% <50%> (-3.79%)	⬇️
pkg/logstore/logstore.go	88.6% <0%> (-8.87%)	⬇️

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[ddollar]

build error outputs