Optimise Dockerfiles to reduce final image size

[tieneupin]

Further optimises the Murfey Dockerfiles to reduce the final image size:

• Mount the build directory as part of the RUN command instead of using COPY
• chown the copied directories as part of the COPY command
• Add echo statements to separate build sections within the RUN statements

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.71%. Comparing base (e1ae7ee) to head (190d26d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #864   +/-   ##
=======================================
  Coverage   54.71%   54.71%           
=======================================
  Files         104      104           
  Lines       11185    11185           
  Branches     1481     1481           
=======================================
  Hits         6120     6120           
  Misses       4740     4740           
  Partials      325      325           

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