Remove Container Build from CI

[callumforrester]

Fixes ongoing issues in CI caused by dependency pinning
Dodal in a container is not used and building conflicts with ophyd-async dependency pinning often, slowing down the merging of some pull requests. This PR removes it, which will hopefully speed things up.

Instructions to reviewer on how to test:

1. Ensure CI still passes

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.45%. Comparing base (c79e882) to head (d5fa814).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #388   +/-   ##
=======================================
  Coverage   93.45%   93.45%           
=======================================
  Files          90       90           
  Lines        3376     3376           
=======================================
  Hits         3155     3155           
  Misses        221      221           

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[DiamondJoseph]

Should remove the "Run in a Container" page of the docs too if we remove the container build.

Is there a ticket for switching to the Copier template?

[DiamondJoseph]

Remove the "Run in a Container" user docs too

[callumforrester]

Done, can make a ticket for copier

[DiamondJoseph]

Done, can make a ticket for copier

If you could, then we can discuss with MX about whether we want to adopt or not. It should be comparatively simple as already using skeleton

[DominicOram]

Is there a ticket for switching to the Copier template?

#378

[DominicOram]

Looks good to me, thanks!