chore: fix broken devcontainer workflow; add gitpod

[markphelps]

• add gitpod, we get free credits for open source repos (https://www.gitpod.io/discover/opensource)
• try to fix devcontainer/docker image since we changed where default db goes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d0d4d9) 71.78% compared to head (82b7a96) 71.78%.

❗ Current head 82b7a96 differs from pull request most recent head 2683227. Consider uploading reports for the commit 2683227 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2611   +/-   ##
=======================================
  Coverage   71.78%   71.78%           
=======================================
  Files          87       87           
  Lines        8271     8271           
=======================================
  Hits         5937     5937           
  Misses       1978     1978           
  Partials      356      356           

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