Variable phrases

For example, to automatically name your infrastructure, releases, or sandboxes. However, you need to obey the following rules:

• Before the variable: any character is allowed.
• After the variable: letters, numbers, and footers (_) are not allowed.

Correct usage:

release-$BUDDY_EXECUTION_ID-staging
release$BUDDY_EXECUTION_ID:staging
release_$BUDDY_EXECUTION_ID[staging]

Incorrect usage:

```text release-$BUDDY_EXECUTION_ID_staging (footer) release-$BUDDY_EXECUTION_IDstaging (letter) release-$BUDDY_EXECUTION_ID1staging (number)