Add support for extraContainers

This adds support for declaring additional containers as part of the pod
spec in the deployment. The driving use case here is to allow us to
deploy the
[aws_signing_helper](https://github.com/aws/rolesanywhere-credential-helper)
in "serve" mode as a sidecar, so we can use the AWS PCA Issuer with IAM
Roles Anywhere.

Signed-off-by: Adam Kafka <[email protected]>

Author: Adam kafka

charts/aws-pca-issuer/templates/deployment.yaml

@@ -85,6 +85,9 @@ spec:
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
           {{- end }}
+      {{- if .Values.extraContainers }}
+        {{- toYaml .Values.extraContainers | nindent 8 }}
+      {{- end }}
       {{- if .Values.volumes }}
       volumes:
         {{ toYaml .Values.volumes | nindent 6 }}

charts/aws-pca-issuer/values.yaml

@@ -154,6 +154,9 @@ volumes: []
 # Additional VolumeMounts on the operator container.
 volumeMounts: []
 
+# Extra containers to add to the pod spec in the deployment.
+extraContainers: []
+
 # Configures a disruption budget for the deployment.
 #
 # Expects input structure similar to https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.24/#poddisruptionbudgetspec-v1-policy