Simplify Dockerfile for a minimal non-root image

[masih]

Remove user switch and additional binary installations from Dockerfile for a minimal non-root image that still contains a shell, at entrypoint sh.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6083519) 45.60% compared to head (fd74773) 45.64%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2504      +/-   ##
==========================================
+ Coverage   45.60%   45.64%   +0.04%     
==========================================
  Files          85       85              
  Lines       10733    10734       +1     
==========================================
+ Hits         4895     4900       +5     
+ Misses       5247     5244       -3     
+ Partials      591      590       -1     

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[willscott]

this looks good to me

[gammazero]

We will need to run the assigner subcommand when running this as an assigner. This means there is some additional change that needs to be made to deployment.