feat: added standalone dns service for loki (#548)

## Description

Creates a standard service in the loki package so that the loki gateway
can rely on the name of this service instead of nonstandard names for
the DNS service in certain k8s distros (i.e. rke2).
...

## Related Issue

Fixes #68 

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor
Guide](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)
followed

Co-authored-by: Micah Nagel <micah.nagel@defenseunicorns.com>

src/loki/chart/templates/service-dns.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: uds-loki-dns
+  namespace: kube-system
+spec:
+  ports:
+  - name: dns
+    port: 53
+    protocol: UDP
+    targetPort: 53
+  - name: dns-tcp
+    port: 53
+    protocol: TCP
+    targetPort: 53
+  selector:
+    k8s-app: kube-dns
+  type: ClusterIP

src/loki/tasks.yaml

@@ -8,6 +8,12 @@ tasks:
             name: app.kubernetes.io/name=loki
             namespace: loki
             condition: Ready
+      - description: Validate uds-loki-dns
+        wait:
+          cluster:
+            kind: Service
+            name: app.kubernetes.io/component=uds-loki-dns
+            namespace: kube-system
       - description: Validate loki-gw
         wait:
           cluster:

src/loki/values/values.yaml

@@ -1,3 +1,7 @@
+# Sets the global DNS service to the service created in this chart
+global:
+  dnsService: "uds-loki-dns"
+
 # -- Overrides the chart's name
 nameOverride: loki
 # -- Overrides the chart's computed fullname