feat: add hostAliases support to Coder helm chart (#24729)

adds support for specifying hostAliases entries in the Coder control
plane pod.

```
➜  coder git:(rowan/helm-hostaliases) helm template coder . --set coder.image.tag=v2.32.0 --set coder.hostAliases[0].hostnames[0]=coder.nicecorp.org --set coder.hostAliases[0].ip=1.1.1.1 
....
---
# Source: coder/templates/coder.yaml
apiVersion: apps/v1
kind: Deployment
....
      hostAliases:
      - hostnames:
        - coder.nicecorp.org
        ip: 1.1.1.1
      restartPolicy: Always
      serviceAccountName: coder
      terminationGracePeriodSeconds: 60
      volumes: []
```

helm/libcoder/templates/_coder.yaml

@@ -59,6 +59,10 @@ spec:
       topologySpreadConstraints:
       {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- with .Values.coder.hostAliases }}
+      hostAliases:
+      {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- with .Values.coder.initContainers }}
       initContainers:
       {{ toYaml . | nindent 8 }}