Update Prometheus from Quay for integration

Use Prometheus image from Quay instead of
the Prometheus image in the Docker registry

Author: vkmc

.github/workflows/integration.yml

@@ -22,7 +22,7 @@ jobs:
     env:
       QDR_CHANNEL: collectd/metrics
       BRIDGE_SOCKET: /tmp/sg-bridge/test-socket
-      PROMETHEUS_IMAGE: prom/prometheus:latest
+      PROMETHEUS_IMAGE: quay.io/prometheus/prometheus:latest
     steps:
       - name: Checkout code
         uses: actions/[email protected]
@@ -118,7 +118,7 @@ jobs:
     env:
       QDR_CHANNEL: anycast/ceilometer/metering.sample
       BRIDGE_SOCKET: /tmp/sg-bridge/test-socket
-      PROMETHEUS_IMAGE: prom/prometheus:latest
+      PROMETHEUS_IMAGE: quay.io/prometheus/prometheus:latest
     steps:
       - name: Checkout code
         uses: actions/[email protected]
@@ -218,7 +218,7 @@ jobs:
     name: "[metrics] transport: socket(tcp); handler: ceilometer-metrics; application: prometheus"
     runs-on: ubuntu-22.04
     env:
-      PROMETHEUS_IMAGE: prom/prometheus:latest
+      PROMETHEUS_IMAGE: quay.io/prometheus/prometheus:latest
     steps:
       - name: Checkout code
         uses: actions/[email protected]