Reduce docker image size

[samuelwei]

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current develop branch head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Changed base image from Debian to Alpine
• Add .env options to customize nginx and php fpm
• Fixed frontend hash calculation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bc1222d) 95.41% compared to head (d40134d) 95.41%.

❗ Current head d40134d differs from pull request most recent head 92dbe5d. Consider uploading reports for the commit 92dbe5d to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #792   +/-   ##
==========================================
  Coverage      95.41%   95.41%           
  Complexity      1032     1032           
==========================================
  Files            279      279           
  Lines           6548     6548           
  Branches         536      536           
==========================================
  Hits            6248     6248           
  Misses           289      289           
  Partials          11       11           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.