Make db port configurable via `POSTGRES_PORT`

[merobi-hub]

Problem

Currently, changing the db port requires modifying several different yml files in the project related to the Docker configuration.

Solution

This makes configuring the db port more developer-friendly by replacing the db port assignments with the existing env var, POSTGRES_PORT. It is given a default value of 5432 in up.sh.

Note: All database schema changes require discussion. Please link the issue for context.

One-line summary: reconfigure docker compose to support easy db port reassignment

Checklist

• [x] You've signed-off your work
• [ ] Your changes are accompanied by tests (if relevant)
• [x] Your change contains a small diff and is self-contained
• [ ] You've updated any relevant documentation (if relevant)
• [x] You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• [ ] You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• [ ] You've included a header in any source code files (if relevant)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (87dcdf6) 80.63% compared to head (ff2d297) 84.45%. Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2751      +/-   ##
============================================
+ Coverage     80.63%   84.45%   +3.82%     
- Complexity      234     1416    +1182     
============================================
  Files            43      251     +208     
  Lines           976     6447    +5471     
  Branches         38      291     +253     
============================================
+ Hits            787     5445    +4658     
- Misses          160      850     +690     
- Partials         29      152     +123     

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