Pin os-capacity to v0.5 release

Author: JohnGarbutt

etc/kayobe/ansible/deploy-os-capacity-exporter.yml

@@ -58,7 +58,7 @@
     - name: Ensure os_capacity container is running
       community.docker.docker_container:
         name: os_capacity
-        image: ghcr.io/stackhpc/os-capacity:master
+        image: ghcr.io/stackhpc/os-capacity:v0.5
         env:
           OS_CLOUD: openstack
           OS_CLIENT_CONFIG_FILE: /etc/openstack/clouds.yaml