switch ui dockerfile to node lts

[rashley-iqt]

Switches the ui's Dockerfile to use node:lts-alpine3.14 as it's base image in order to deal with: facebook/create-react-app#11565. However, I think it makes more sense to continue to use the long term support base image at this point.

[codecov]

Codecov Report

Merging #651 (317c2c1) into main (0d95687) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #651   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           15        15           
=========================================
  Hits            15        15           

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