Fixing Cache and Docker CI

[calvinp0]

The Docker CI is running out of space, thus adding a removal run of unneccesaryfiles. The Cache CI fails with RMS installation via Julia. Reworked the installation code.

[codecov-commenter]

Codecov Report

Merging #142 (da97d4e) into main (2de3b76) will increase coverage by 1.69%.
Report is 74 commits behind head on main.
The diff coverage is 83.77%.

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   73.46%   75.15%   +1.69%     
==========================================
  Files          22       24       +2     
  Lines        2891     3293     +402     
  Branches      762      842      +80     
==========================================
+ Hits         2124     2475     +351     
- Misses        552      593      +41     
- Partials      215      225      +10     

Flag	Coverage Δ
unittests	75.15% <83.77%> (?)

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

Files	Coverage Δ
t3/common.py	89.77% <100.00%> (+5.86%)	⬆️
t3/logger.py	60.00% <ø> (-1.09%)	⬇️
t3/settings/t3_settings.py	100.00% <ø> (ø)
t3/settings/t3_submit.py	100.00% <ø> (ø)
t3/runners/rmg_runner.py	34.37% <0.00%> (ø)
t3/imports.py	30.00% <40.00%> (ø)
t3/simulate/rmg_constantTP.py	58.41% <0.00%> (ø)
t3/utils/fix_cantera.py	90.66% <90.66%> (ø)
t3/utils/flux.py	84.35% <84.35%> (ø)

... and 1 file with indirect coverage changes

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[alongd]

Thanks @calvinp0 for investing in a quality CI for T3. Much appreciated.