[2.x] Pass in env variable and -t flag to set "admin" as the initial admin password

[derek-ho]

Description

Consumes changes in 2.x line of security backend plugin that requires admin password to be set via an environment variable. Also changes the CI to run in "test" mode to accept the weak admin password "admin".

Category

[Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation]

Why these changes are required?

What is the old behavior before changes and new behavior after changes?

Issues Resolved

[List any issues this PR will resolve (Is this a backport? If so, please add backport PR # and/or commits #)]

Testing

[Please provide details of testing done: unit testing, integration testing and manual testing]

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3189b03) 66.76% compared to head (c143b3c) 66.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x    #1708   +/-   ##
=======================================
  Coverage   66.76%   66.76%           
=======================================
  Files          93       93           
  Lines        2353     2353           
  Branches      311      311           
=======================================
  Hits         1571     1571           
  Misses        705      705           
  Partials       77       77           

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