Docker add utilities

[angusjfw]

Status	Ticket/Issue
Ready/Hold	Ticket

Main changes

Screenshots (feature, test output, profiling, dev tools etc)

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Other notes (e.g. implementation quirks, edge cases, questions / issues)

Manual testing tips

Tag anyone who definitely needs to review or help

[codecov]

Codecov Report

Base: 74.85% // Head: 73.45% // Decreases project coverage by -1.40% ⚠️

Coverage data is based on head (4e734d9) compared to base (7804716).
Patch coverage: 84.61% of modified lines in pull request are covered.

❗ Current head 4e734d9 differs from pull request most recent head ff61742. Consider uploading reports for the commit ff61742 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
- Coverage   74.85%   73.45%   -1.41%     
==========================================
  Files          25       26       +1     
  Lines        1229     1164      -65     
==========================================
- Hits          920      855      -65     
  Misses        309      309              

Flag	Coverage Δ
unittests	73.45% <84.61%> (-1.41%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
further_link/endpoint/status.py	61.90% <61.90%> (ø)
further_link/endpoint/run.py	83.18% <72.22%> (+0.01%)	⬆️
further_link/util/async_files.py	82.14% <82.14%> (ø)
further_link/util/id_generator.py	87.50% <83.33%> (-2.98%)	⬇️
further_link/runner/process_handler.py	84.57% <84.61%> (+0.25%)	⬆️
further_link/util/pty.py	89.58% <89.58%> (ø)
further_link/__main__.py	89.18% <100.00%> (-1.29%)	⬇️
further_link/endpoint/upload.py	100.00% <100.00%> (ø)
further_link/runner/exec_process_handler.py	93.33% <100.00%> (ø)
further_link/runner/py_process_handler.py	92.85% <100.00%> (ø)
... and 7 more

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