Added local docker compose setup for development

[cmraible]

no issue

• Added Dockerfile for developing Ghost locally in a docker container
• Added yarn up command and yarn compose command as convenience aliases for docker compose commands to avoid typing in the -f docker/docker-compose.yml for every command
• This is the first step toward using things like devcontainers and Github Codespaces to create a simple, consistent developer experience for all contributors.
• Moved to nodemon as Docker file sync appears to copy over a new file with the same name, breaking the way node --watch functions.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 73.81%. Comparing base (607dee2) to head (00c190f). Report is 250 commits behind head on main.

Files with missing lines	Patch %	Lines
ghost/core/core/shared/config/loader.js	83.33%	6 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21279      +/-   ##
==========================================
+ Coverage   73.70%   73.81%   +0.10%     
==========================================
  Files        1285     1284       -1     
  Lines       76010    76465     +455     
  Branches    10114    10164      +50     
==========================================
+ Hits        56021    56440     +419     
- Misses      19060    19088      +28     
- Partials      929      937       +8     

Flag	Coverage Δ
admin-tests	46.79% <ø> (+0.68%)	:arrow_up:

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[cmraible]

This is ready to go, planning to merge first thing tomorrow AM.