refactor(docker): avoid copying volume inside container

[alerque]

A different way to work around the problems noted in #108, c.f trailing comments in #109.

[alerque]

Untested because I have to run out, but this is roughly the approach I took on some other projects adapted for the way this project is laid out.

[codecov-commenter]

Codecov Report

Base: 43.24% // Head: 43.24% // No change to project coverage 👍

Coverage data is based on head (8251eef) compared to base (38943e8).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   43.24%   43.24%           
=======================================
  Files          12       12           
  Lines         562      562           
=======================================
  Hits          243      243           
  Misses        319      319           

Flag	Coverage Δ
unit-tests	43.24% <ø> (ø)

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[orhun]

Looks like git is not installed in debian:buster-slim image.

[alerque]

Interesting. We can probably just echo the config to the file in /etc. My project is also a Rust + libgit2 one and it reads that config, but my Docker container also happened to have git available so that was an easy way to get setup.

[orhun]

@alerque Can you check out if this actually works?

[orhun]

Kind ping @alerque

[welcome]

Congrats on merging your first pull request! ⛰️