handle env variables in dynamic secret file

[alban-stourbe-wmx]

Proposed changes

Add env variables in dynamic secret files.

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[GeorginaReeder]

Thanks for your contribution @alban-stourbe-wmx ! :)

[tarunKoyalwar]

lgtm !

along with env secrets now secrets can also be specified from -v and -env-vars ex:

Env based secret

variables:
   - key: password
     value: $PASSWORD

Config file / Flag based secrets ( using -env-vars or -vars )

variables:
     - key: password
     - value: {{password}}

[tarunKoyalwar]

• needs rebase from dev

[alban-stourbe-wmx]

• needs rebase from dev

Hi @tarunKoyalwar, the rebase has been made. Thank for the code added ☝️

[ehsandeep]

Thank you @alban-stourbe-wmx for this update, FYI we are also working on #5841

[alban-stourbe-wmx]

Thank you @alban-stourbe-wmx for this update, FYI we are also working on #5841

Thanks to you and also congrats to @dwisiswant0 and @tarunKoyalwar