Add service annotations to the helm chart

Signed-off-by: Jakub Surdej <jakub.sudej@shift4.com>

configs/helm/tests/service_test.yaml

@@ -0,0 +1,21 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/helm-unittest/helm-unittest/main/schema/helm-testsuite.json
+---
+suite: service tests
+templates:
+  - service.yaml
+tests:
+  - it: render default service
+    asserts:
+      - isKind:
+          of: Service
+      - equal:
+          path: metadata.name
+          value: RELEASE-NAME-prometheus-rds-exporter-chart
+  - it: render service with annotations
+    values:
+      - ./values/with_service.yaml
+    asserts:
+      - equal:
+          path: metadata.annotations
+          value:
+            "prometheus.io/scrape": "true"

configs/helm/tests/values/with_service.yaml

@@ -0,0 +1,4 @@
+---
+service:
+  annotations:
+    "prometheus.io/scrape": "true"

configs/helm/values.yaml

@@ -48,6 +48,8 @@ securityContext:
 service:
   type: ClusterIP
   port: 9043
+  # Additional annotations for the service
+  annotations: {}
 
 ingress:
   enabled: false