Better non-root permission handling

[caronc]

Description:

Just a bit of cleanup on the container to limit the root user and bulletproof the handling of the configuration a bit better out of the box.

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• tests added

[codecov-commenter]

Codecov Report

Merging #55 (9ca0bfd) into master (ddb2092) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #55   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         5    -1     
  Lines          420       364   -56     
=========================================
- Hits           420       364   -56     

Impacted Files	Coverage Δ
apprise_api/api/utils.py	100.00% <100.00%> (ø)
apprise_api/core/settings/pytest/__init__.py

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