feat(Dockerfile): use .nvmrc to build the image

[PixnBits]

Description

use .nvmrc to build the image
and run workflows, creating a single point to define the Node.js version to use and thus making upgrades easier

Motivation and Context

Avoid the myriad of locations where Node.js versions are recorded, i.e. Dockerfile and workflows. package.json engines will still need manual updates though (perhaps that can be a workflow, or a unit test to ensure it is satisfied by the contents of .nvmrc?)

How Has This Been Tested?

built locally, though not run, but did see the expected label used when manually running $ docker build . --build-arg VERSION=18.17.0 and docker build . --build-arg VERSION=$(cat .nvmrc)

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (adding or updating documentation)
• Dependency update
• Security update

Checklist:

• My change requires a change to the documentation and I have updated the documentation accordingly.
• These changes should be applied to a maintenance branch. (feat(Dockerfile): use .nvmrc to build the image (5.x.x) #1375)
• This change requires cross browser checks.
• Performance tests should be ran against the server prior to merging.
• This change impacts caching for client browsers.
• This change impacts HTTP headers.
• This change adds additional environment variable requirements for One App users.
• I have added the Apache 2.0 license header to any new files created.

What is the Impact to Developers Using One App?

faster Node.js version updates? this is more for the maintainers so no impact to devs is the basic requirement 😅

[github-actions]

Size Change: 0 B

Total Size: 710 kB

ℹ️ View Unchanged

Filename	Size
./build/app/app.js	164 kB
./build/app/app~vendors.js	411 kB
./build/app/runtime.js	7.07 kB
./build/app/service-worker-client.js	7.25 kB
./build/app/vendors.js	121 kB

_{compressed-size-action}

[code-forger]

See comment

[code-forger]

This PR will look like its not building, because our settings require workflows that this PR removes.

Once this PR is ready and approved, the setting should be changed immediately before merge

Not currently available and I believe that change has been resolved.