Helm Chart: Add support for tolerations (#1192)

Problem: There's no way to configure tolerations for the NGINX
Gateway Fabric Pod in the helm chart.

Solution: Add support for tolerations to be supplied if required. If not provided, there is no change to the deployment

Author: oWretch

deploy/helm-chart/README.md

@@ -226,6 +226,7 @@ The following tables lists the configurable parameters of the NGINX Gateway Fabr
 | `nginx.image.pullPolicy`                          | The `imagePullPolicy` for the NGINX image.                                                                                                                                                                   | Always                                                                                                          |
 | `nginx.lifecycle`                                 | The `lifecycle` of the nginx container.                                                                                                                                                            | {}                                                                                                              |
 | `terminationGracePeriodSeconds`                   | The termination grace period of the NGINX Gateway Fabric pod.                                                                                                                                                            | 30                                                                                                              |
+| `tolerations`                                     | The `tolerations` of the NGINX Gateway Fabric pod.                                                                                                                                                           | []                                                                                                              |
 | `affinity`                                        | The `affinity` of the NGINX Gateway Fabric pod.                                                                                                                                                            | {}                                                                                                              |
 | `serviceAccount.annotations`                      | The `annotations` for the ServiceAccount used by the NGINX Gateway Fabric deployment.                                                                                                                    | {}                                                                                                              |
 | `serviceAccount.name`                             | Name of the ServiceAccount used by the NGINX Gateway Fabric deployment.                                                                                                                                  | Autogenerated                                                                                                   |

deploy/helm-chart/templates/deployment.yaml

@@ -143,6 +143,10 @@ spec:
       securityContext:
         fsGroup: 1001
         runAsNonRoot: true
+      {{- if .Values.tolerations }}
+      tolerations:
+      {{- toYaml .Values.tolerations | nindent 6 }}
+      {{- end }}
       volumes:
       - name: nginx-conf
         emptyDir: {}

deploy/helm-chart/values.yaml

@@ -61,6 +61,9 @@ nginx:
 ## The termination grace period of the NGINX Gateway Fabric pod.
 terminationGracePeriodSeconds: 30
 
+## Tolerations for the NGINX Gateway Fabric pod.
+tolerations: []
+
 ## The affinity of the NGINX Gateway Fabric pod.
 affinity: {}