Allow adding extra volumes to openstack-exporter deployment

credit to the original author: Ondrej Vasko <o.vasko@pan-net.eu>
ref: openstack-exporter#11

Signed-off-by: Matej Feder <matej.feder@dnation.cloud>

charts/prometheus-openstack-exporter/templates/deployment.yaml

@@ -32,8 +32,11 @@ spec:
         {{- . | toYaml | nindent 8 }}
         {{- end }}
         volumeMounts:
-          - name: openstack-config
-            mountPath: /etc/openstack
+        - name: openstack-config
+          mountPath: /etc/openstack
+        {{- if .Values.extraVolumeMounts }}
+          {{- toYaml .Values.extraVolumeMounts | nindent 8 }}
+        {{- end }}
         ports:
         - name: metrics
           containerPort: 9180
@@ -46,6 +49,9 @@ spec:
       - name: openstack-config
         secret:
           secretName: openstack-config
+      {{- if .Values.extraVolumes }}
+        {{- toYaml .Values.extraVolumes | nindent 6 }}
+      {{- end }}
     {{- with .Values.hostAliases }}
       hostAliases:
 {{ toYaml . | indent 8 }}

charts/prometheus-openstack-exporter/values.yaml

@@ -50,6 +50,21 @@ multicloud:
 #commonLabels:
 #  prometheus.io/monitor: "true"
 
+# Add extra volumes mounted to openstack-exporter deployment
+# Useful for mounting CA Certificates
+#extraVolumes:
+#- name: company-ca
+#  configMap:
+#    name: my-company-ca
+#    items:
+#    - key: ca
+#      path: my-company-ca
+#
+#extraVolumeMounts:
+#- mountPath: /etc/ssl/certs/my-company-ca
+#  name: company-ca
+#  subPath: my-company-ca
+
 # Generate a secret for clouds.yaml
 # Doc: https://github.com/openstack-exporter/openstack-exporter#openstack-configuration
 clouds_yaml_config: |