Support for Tolerations

Summary

Request to add the support of tolerations as we're looking to scale down the PB padawan nodes and move mattermost to a specific node pool.

Steps to reproduce

Current chart doesn't support tolerations.

What is the current behavior?

We can't assign a pod to a specific node pool/workload.

What is the expected behavior?

Able to schedule the mattermost pod on a node with tolerated taint.

Relevant logs and/or screenshots

N/A

Possible fixes

Update the mattermost.yaml template to support tolerations.

Spoke to @michaelmcleroy and said this could be done.

AC:

• Add templating to allow this chart to support taints+tolerations via the mattermost custom resource
• Bump version in chart/Chart.yaml and CHANGELOG.md
• Re-generate README
• Create Merge Request into BigBang with new package tag that includes above additions
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