Tell yamllint to allow long lines in ci.yaml

There are too many lines with hashes that go over 80 chars, and some of
the key values are troublesome to try to split across multiple lines.

Author: mhucka

.github/workflows/ci.yaml

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# yamllint disable rule:line-length
+
 name: Continuous integration
 run-name: >-
   Run CI checks for ${{github.event_name}} on ${{github.ref_name}}