Fix browser prompting ERR_CERT_INVALID for direct HTTPS access

[oneoneonepig]

The notBefore and notAfter x509 field is missing when creating the certificate, causing the certificate to have no valid date information. The notBefore and notAfter decodes to "00010101000000Z", which seems like a "GeneralizedTime" according to RFC5280 and decodes to something like 0001/1/1, eventually causing the browser to prompt certificate error.

If the self-signed certificate is invalid because of the duration, subject name, insecure algorithm or EKU, user should be able to skip the certificate invalid prompt since most of the self-signed certificate are for developing.

Also I've modified the deployment YAMLs so that the self-signed certificates can show proper subject name instead of leaving it empty.

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[oneoneonepig]

Fixes #2947

[floreks]

/lgtm

[codecov]

Codecov Report

Merging #4860 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #4860      +/-   ##
=========================================
+ Coverage   45.39%   45.4%   +<.01%     
=========================================
  Files         214     214              
  Lines        9978    9983       +5     
  Branches       94      94              
=========================================
+ Hits         4530    4533       +3     
- Misses       5184    5185       +1     
- Partials      264     265       +1

Impacted Files	Coverage Δ
src/app/backend/cert/ecdsa/creator.go	15% <0%> (-1%)	⬇️
src/app/backend/sync/secret.go	73.26% <0%> (+2.97%)	⬆️

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[shu-mutou]

/lgtm
Thanks!! I could confirm that NET::ERR_CERT_INVALID was changed to NET::ERR_CERT_AUTHORITY_INVALID and we can proceed anyway, i.e. using link Proceed to localhost (unsafe).

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floreks, oneoneonepig, shu-mutou

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