Chore: Add smaller size c7 node

As we continue to work on the SIGUL tag signing issue, we
are only left with release jobs running on C7. These jobs could
be running on a smaller node.

Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: I8c9e8397f6e9f0d2bc2322aea1e4644956384cf8
1 file changed