Posts an AS3 declaration to declare a single app in a tenant, optionally runs mustache before.
Reference: https://clouddocs.f5.com/products/extensions/f5-appsvcs-extension/latest/userguide/per-app-declarations.html
Usage: f5.as3.app.declare [options...] <tenant name> <as3 declaration file>
Options:
-d <defaults file> Define a custom variable file. Default is <AS3 declaration file>.var.
-k Keeps the temporary files.
-sVAR=VALUE Define a custom variable.
-t Process the AS3 declaration file with mustache.
-v Validate the declaration by the dry-run action.
