Nit: should this be defined as pull-request-url (and this modified to env.pull-request-url)? It's weird to call it base-branch, since we have that from input.

[marilene38]

          Nit: should this be defined as pull-request-url (and this modified to env.pull-request-url)? It's weird to call it base-branch, since we have that from input.

Originally posted by @onetechnical in #564 (comment)