grafana-watcher: allow credentials from env variable

hack/scripts/generate-grafana-credentials-secret.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 user password"
+    exit 1
+fi
+
+user=$1
+password=$2
+
+cat <<-EOF
+apiVersion: v1
+kind: Secret
+metadata:
+  name: grafana-credentials
+data:
+  user: $(echo -n ${user} | base64 --wrap=0)
+  password: $(echo -n ${password} | base64 --wrap=0)
+EOF
+

hack/scripts/generate-manifests.sh

@@ -6,6 +6,9 @@ hack/scripts/generate-rules-configmap.sh > manifests/prometheus/prometheus-k8s-r
 # Generate Dashboard ConfigMap
 hack/scripts/generate-dashboards-configmap.sh > manifests/grafana/grafana-dashboards.yaml
 
+# Generate Grafana Credentials Secret
+hack/scripts/generate-grafana-credentials-secret.sh admin admin > manifests/grafana/grafana-credentials.yaml
+
 # Generate Secret for Alertmanager config
 hack/scripts/generate-alertmanager-config-secret.sh > manifests/alertmanager/alertmanager-config.yaml