Close docker client

[ChristopherHX]

Please stop leaking unix sockets, it breaks my github-act-runner program.

Reference: ChristopherHX/github-act-runner#41

[codecov]

Codecov Report

Merging #789 (7a88802) into master (0f04942) will increase coverage by 6.87%.
The diff coverage is 61.44%.

@@            Coverage Diff             @@
##           master     #789      +/-   ##
==========================================
+ Coverage   49.27%   56.14%   +6.87%     
==========================================
  Files          23       23              
  Lines        2401     3751    +1350     
==========================================
+ Hits         1183     2106     +923     
- Misses       1090     1471     +381     
- Partials      128      174      +46     

Impacted Files	Coverage Δ
pkg/container/docker_volume.go	0.00% <0.00%> (ø)
pkg/container/docker_run.go	5.56% <15.09%> (+3.63%)	⬆️
pkg/common/git.go	49.82% <31.81%> (-9.97%)	⬇️
pkg/model/planner.go	49.78% <42.50%> (+16.70%)	⬆️
pkg/container/docker_build.go	60.81% <57.14%> (+60.81%)	⬆️
pkg/container/docker_pull.go	35.29% <61.53%> (+17.11%)	⬆️
pkg/model/workflow.go	52.14% <63.63%> (+26.42%)	⬆️
pkg/runner/runner.go	74.46% <70.37%> (-2.01%)	⬇️
pkg/runner/expression.go	85.71% <72.09%> (-0.93%)	⬇️
pkg/runner/step_context.go	78.57% <77.15%> (+9.62%)	⬆️
... and 27 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f8ddfca...7a88802. Read the comment docs.

[mergify]

@ChristopherHX this pull request has failed checks 🛠

[github-actions]

PR is stale and will be closed in 14 days unless there is new activity

[mergify]

@ChristopherHX this pull request has failed checks 🛠

[ChristopherHX]

I really want that act closes their docker connection or reuses it. Leaking a docker connection is bad code quality.

one tests pulls ubuntu:18.04 in arm64 which triggers the rate limit, the only reason for needs-work
while ubuntu:18.04 for native x86_64 is cached via my workflow change,