Helm chart to deploy it

[koyan]

Not an issue itself, but in order to deploy it to kubernetes I created a helm chart for it

One note: From the instructions it seemed like it would work if with the jira_uri, jira_password and jira_username existed as environment values, and the file config.toml was not there. As far as I could tell though, this is not the case. The installation needs the config.toml to be there always (which made the helm chart a bit complicated). If I am correct and in a future version you make it work without the config.toml (if env variables are available), tell me so that I will simplify also the helm chart.