Add deployers

[Nuru]

what

• Add deployment_principal_arns and deployment_actions
• Add s3_website_password_enabled
• Restore template parsing of additional_bucket_policy removed by Replaced old data.template_file to use latest aws provider and tf #141. Closes Variables in additional_bucket_policy are not substituted anymore #153
• Only create referer password when needed. Supersedes and closes fix: only create referer password when needed #159
• General cleanup, enhance README. Fixes Error using existing S3 bucket in 0.59.0 #151

why

• Along with creating the S3 bucket, enable selected IAM Principals (such as CI/CD) to upload content to it.
• PR Make S3 website private; add S3 origin #105 made it difficult to directly access the S3 Website created with website_enabled = true. This was a breaking change, as before the S3 Website was public. Adding s3_website_password_enabled to make the Make S3 website private; add S3 origin #105 change optional and default it to false to retain backward compatibility.
• PR Replaced old data.template_file to use latest aws provider and tf #141 was only supposed to remove the obsolete implementation of the feature, not the feature itself.
• Best practice is not to create unneeded resources.
• The effect of website_enabled was not well documented. The code was quite confusing to follow due to conditionals scattered throughout.

[Nuru]

/test all