Merge branch 'release-5.1.0' of...

Merge branch 'release-5.1.0' of https://github.com/project-sunbird/sunbird-devops into release-5.1.0

* 'release-5.1.0' of https://github.com/project-sunbird/sunbird-devops:
  Add kafka_bootstrap_address env key
  Update config.j2 (#3644)
  Add environment keys to enable async certificate
  LR-262 CSP related variable - Cloud storage base path added (#3641)
  Release 5.1.0 (#3637)
  Set authentication_enabled as false by default
  fix: adding verbosity for desktop deploy (#3633)
  updated certificatesign helm_chart
  added config.json file in certificatesign and updated templates
  updated CACHE_CONTEXT_URLS var (#3625)
  Update main.yml
  Change condition to match boolean (#3623)
  Fix syntax (#3621)
  Make roles as anonymous for project certificate
  variables changes - private vars
  variables changes for sunbird cloud agnostic tool
  removed unused variables
  sunbird cdn configuration