Support podman for local dev environments

[nellh]

This includes some general simplification of the dev environment, reducing the need to maintain as many docker volumes. This also allows OpenNeuro to run in a dev environment where the user running it may not have root access (such as nested within a flatpak or on a multiuser server) assuming the system is otherwise compatible with rootless docker or podman.

I updated documentation to point at podman-compose but docker-compose v1 should continue to work. Usage is identical to docker-compose. podman-compose up -d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (60cf11e) 72.76% compared to head (068d636) 64.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2942      +/-   ##
==========================================
- Coverage   72.76%   64.86%   -7.91%     
==========================================
  Files          43      378     +335     
  Lines        1597    24221   +22624     
  Branches        0      864     +864     
==========================================
+ Hits         1162    15710   +14548     
- Misses        435     8511    +8076     

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