Add environment variables definitions for serverless and move other similar env config to docs

[alhambrav]

Latest version

• [X] The issue is in the develop branch
• [X] The issue is in the latest released 4.1.x
• [ ] The issue is in the latest released 4.0.x
• [ ] The issue is in the latest released 3.1.x

Duplicates

• [X] I have searched the existing issues

Is your enhancement request related to a problem? Please describe.

There are no mentions of environment variables for serverless in the docs

Describe the solution you'd like

Add environment variables for serverless in the docs:

# -------------------- Serverless variables --------------------
export AWS_S3_ENDPOINT=${AWS_S3_ENDPOINT:=""}
export AWS_S3_PATH_STYLE_ACCESS=${AWS_S3_PATH_STYLE_ACCESS:="false"}

export SERVERLESS_NAMESPACE=${SERVERLESS_NAMESPACE:=cloud-sites}

export PREVIEW_BUCKET_NAME_PATTERN=${PREVIEW_BUCKET_NAME_PATTERN:="${SERVERLESS_NAMESPACE}-blobs-\${siteName}"}
export PREVIEW_BUCKET_PREFIX_PATTERN=${PREVIEW_BUCKET_PREFIX_PATTERN:=""}

export STAGING_BUCKET_NAME_PATTERN=${STAGING_BUCKET_NAME_PATTERN:="${SERVERLESS_NAMESPACE}-site-\${siteName}-staging"}
export STAGING_BUCKET_PREFIX_PATTERN=${STAGING_BUCKET_PREFIX_PATTERN:=""}

export LIVE_BUCKET_NAME_PATTERN=${LIVE_BUCKET_NAME_PATTERN:="${SERVERLESS_NAMESPACE}-site-\${siteName}"}
export LIVE_BUCKET_PREFIX_PATTERN=${LIVE_BUCKET_PREFIX_PATTERN:=""}

[alhambrav]

https://docs.craftercms.org/en/4.1/by-role/system-admin/configuration.html#environment-variables

https://github.com/craftercms/craftercms/blob/develop/README.md https://github.com/craftercms/craftercms/blob/support/4.1.x/README.md