Implement best practices in Docker image

[VKTB]

Description

This PR implements best practices in the Docker image.

In summary, the changes do the following:

• Removes the lines that sets the PATH because the image builds and the container works fine without it.
• Build cache is leveraged in the build stage to reduce the build time when changes are made to the source code over and over again. This is accomplished by copying the package.json, tsconfig.json and yarn.lock files and installing the dependencies first, and then copying the source code and building the app. Because each COPY and RUN command is a new layer, this ensures that the layers for copying and installing the dependencies are cached when changes are made to the source code.
• Configures the image so that containers run using the non-root www-data user account that the httpd image defines.
• Uses setcap to allow non-root user accounts to bind to privileged ports (port 80 in this case) as these ports are only permitted to root by default. I found this solution in this article.
• Changes the access rights for the Apache's logs directory from root to www-data user account.

Testing instructions

• Review code
• Check Actions build
• Review changes to test coverage
• Image builds successfully
• Container starts successfully

[codecov]

Codecov Report

Merging #1077 (958353c) into k8s-deployment (ea62522) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           k8s-deployment    #1077   +/-   ##
===============================================
  Coverage           97.94%   97.94%           
===============================================
  Files                  42       42           
  Lines                1557     1557           
  Branches              422      423    +1     
===============================================
  Hits                 1525     1525           
  Misses                 31       31           
  Partials                1        1           

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[moonraker595]

Looks good 👍