feat: Add openstack db exporter (#1039)

diff --git a/roles/defaults/vars/main.yml b/roles/defaults/vars/main.yml
index ca82bc7..8964b7c 100644
--- a/roles/defaults/vars/main.yml
+++ b/roles/defaults/vars/main.yml
@@ -172,6 +172,7 @@
   prometheus_memcached_exporter: quay.io/prometheus/memcached-exporter:v0.10.0@sha256:fa5a2de1a4744da66fb369bee81232f5ea52208bc643e409a60f66d699ac27b2
   prometheus_mysqld_exporter: quay.io/prometheus/mysqld-exporter:v0.14.0@sha256:eb6fe170738bf9181c51f5bc89f93adb26672ec49ffdcb22f55c24834003b45d
   prometheus_node_exporter: quay.io/prometheus/node-exporter:v1.7.0@sha256:4cb2b9019f1757be8482419002cb7afe028fdba35d47958829e4cfeaf6246d80
+  prometheus_openstack_database_exporter: ghcr.io/vexxhost/openstack-database-exporter:v0.2.0@sha256:286573f63840f961a6861982f7b3e8007b9a93eed77ec4476810af3286cb7fd9
   prometheus_openstack_exporter: ghcr.io/openstack-exporter/openstack-exporter:1.7.0@sha256:e5146a7dd5153c035fd8060899e3504b25557756ef4a4d85860a409247404f97
   prometheus_operator_kube_webhook_certgen: registry.k8s.io/ingress-nginx/kube-webhook-certgen:v20221220-controller-v1.5.1-58-g787ea74b6@sha256:5e6fdb9b2c74ad2576dd835b389d00d18ccfee21b547d1a79efb881009664099
   prometheus_operator: quay.io/prometheus-operator/prometheus-operator:v0.71.2@sha256:bbf3c671e65b0c115d2196bbe7fed0bcdc59f44b7c93868cd40d1c90cbd3806e