feat(aio/Dockerfile): Add nonroot user to final image

[jchauncey]

Vulnerability scans against the dashboard image show that it was created with a nonroot user. Even if the user is changed in the deployment yaml this will still fail the scan.

I have made a similar change for metrics scraper - kubernetes-sigs/dashboard-metrics-scraper#32

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[codecov]

Codecov Report

Merging #5237 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5237      +/-   ##
==========================================
- Coverage   45.45%   45.44%   -0.02%     
==========================================
  Files         214      214              
  Lines       10099    10097       -2     
  Branches      108      105       -3     
==========================================
- Hits         4591     4589       -2     
+ Misses       5241     5239       -2     
- Partials      267      269       +2     

Impacted Files	Coverage Δ
src/app/backend/resource/pod/common.go	53.26% <0.00%> (-5.08%)	⬇️
src/app/frontend/overview/component.ts	76.92% <0.00%> (-1.65%)	⬇️
src/app/frontend/overview/helper.ts	89.47% <0.00%> (-0.53%)	⬇️
src/app/frontend/login/component.ts	81.94% <0.00%> (-0.25%)	⬇️
src/app/frontend/common/pipes/module.ts	100.00% <0.00%> (ø)
src/app/frontend/common/errors/errors.ts	53.84% <0.00%> (ø)
src/app/frontend/common/pipes/safehtml.ts	42.85% <0.00%> (ø)
src/app/frontend/common/pipes/relativetime.ts	25.58% <0.00%> (ø)
src/app/frontend/common/animations/animations.ts	100.00% <0.00%> (ø)
src/app/frontend/common/resources/groupedlist.ts	50.00% <0.00%> (ø)
... and 12 more

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[floreks]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floreks, jchauncey

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