General improvements

[gurkanindibay]

Publish Docker improvements

• Build & Tag and publish logic should be seperated and should be used as seperated steps in pipelines
• github_ref parameter should be parsed and used as meaningful business paramters in the code.This parametter should not be used as input parameter for internal methods
• All of the messages for the build should be printed even if build is successful

Citus Package Improvements

• packaging_encryption key packaging_passphrase variables are optional especially for community packages. These parameter should be validated according to thier enterprise/comminty nature and if it is not needed, it should not be mandatory
• default value for gh_token variable should be environment variable with the same name
• There should be a summary section which summarizes all of the warnings and ignored warnings at the end of the build