Only copy docs generated by build-docs-nightly to master node

Master node is used to archive the latest TF-M docs for tf.org.
Only docs generated by tf-m-build-docs-nightly job
should be copied to this folder.

Job tf-m-build-docs could also be triggered by per-patch job,
which is likely to generate TF-M docs in other version.
So docs generated by tf-m-build-docs should not be copied.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Iac7816578b788b85950ebce0fecbf3843f52359c
1 file changed