Add semaphore-molecule

We would like to limit maximum value of executed CI jobs in the same
time. By adding semaphore with limit, should help with that.

Signed-off-by: Daniel Pawlik <[email protected]>

Author: danpawlik

zuul.d/molecule-base.yaml

@@ -4,6 +4,7 @@
     name: cifmw-molecule-base
     nodeset: centos-stream-9-ibm
     parent: base-ci-framework
+    semaphore: semaphore-molecule
     provides:
       - cifmw-molecule
     pre-run:

zuul.d/semaphores.yaml

@@ -0,0 +1,4 @@
+---
+- semaphore:
+    name: semaphore-molecule
+    max: 15