Small fixes & embetterments

[akx]

• Makes logging a little less verbose
• Use shutil.which to find docker (to avoid one needless /usr/bin/env)
• Ensures docker_logout gets called even if an exception occurs

[codecov-commenter]

Codecov Report

Merging #15 (0672555) into master (93da01b) will decrease coverage by 0.30%.
The diff coverage is 77.27%.

❗ Current head 0672555 differs from pull request most recent head 7fe70d1. Consider uploading reports for the commit 7fe70d1 to get more accurate results

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   96.49%   96.19%   -0.31%     
==========================================
  Files          15       15              
  Lines         257      263       +6     
  Branches       17       16       -1     
==========================================
+ Hits          248      253       +5     
- Misses          5        6       +1     
  Partials        4        4              

Impacted Files	Coverage Δ
laituri_tests/mock_process.py	89.47% <0.00%> (ø)
laituri_tests/test_docker_v1.py	90.00% <57.14%> (-1.67%)	⬇️
laituri/docker/credential_manager/docker_v1.py	100.00% <100.00%> (ø)
laituri/docker/credential_manager/errors.py	100.00% <100.00%> (ø)

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[tokkoro]

2022/2022 ✔️