Fix CA build

[chrieinv]

Building CA test image fails with the error

#20 [frontend  3/11] RUN npm i -g npm node-gyp
#20 0.893 npm ERR! code EBADENGINE
#20 0.895 npm ERR! engine Unsupported engine
#20 0.896 npm ERR! engine Not compatible with your version of node/npm: npm@10.0.0
#20 0.897 npm ERR! notsup Not compatible with your version of node/npm: npm@10.0.0
#20 0.898 npm ERR! notsup Required: {"node":"^18.17.0 || >=20.5.0"}
#20 0.898 npm ERR! notsup Actual:   {"npm":"8.19.4","node":"v16.20.2"}

Attempt to fix by not installing/updating npm

[codecov]

Codecov Report

Merging #2474 (4086d63) into master (c75c8d0) will not change coverage.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2474   +/-   ##
=========================================
  Coverage     60.27%   60.27%           
  Complexity     2774     2774           
=========================================
  Files           289      289           
  Lines         12550    12550           
=========================================
  Hits           7565     7565           
  Misses         4985     4985           

Components	Coverage Δ
contentauthor	60.27% <ø> (ø)