backport: bug fixes for 0.21

[lance]

Changes

• fix: auth check (fix: auth check #773)
• chore: skip integration tests for now (chore: skip integration tests in upstream release scripts for now #780)
• fix: error type-check condition (fix: error type-check condition #786)
• fix: use domain qualified registry for springboot (fix: use domain qualified registry for springboot #789)
• fix: use paketo base image for springboot (fix: use paketo base image for springboot #792)

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance

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[codecov]

Codecov Report

Merging #793 (eead4c1) into release-0.21 (a579391) will increase coverage by 3.38%.
The diff coverage is 25.00%.

@@               Coverage Diff                @@
##           release-0.21     #793      +/-   ##
================================================
+ Coverage         41.52%   44.91%   +3.38%     
================================================
  Files                42       42              
  Lines              4101     3747     -354     
================================================
- Hits               1703     1683      -20     
+ Misses             2145     1812     -333     
+ Partials            253      252       -1     

Impacted Files	Coverage Δ
docker/creds/credentials.go	67.82% <25.00%> (-0.02%)	⬇️
knative/deployer.go	1.85% <0.00%> (-3.75%)	⬇️

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[matejvasek]

/lgtm
/hold until test pass

[lance]

/unhold