Simple install script for ESS CE.

[rxl881]

A simple install script for ESS community edition. Although it works for my use-case, it will need further work for general use. For example it currently only supports installation using wildcard certs (but the other cases can be simply added to the switch statement).

[CLAassistant]

All committers have signed the CLA.

[benbz]

Hi Rick, thanks for providing this initial PR of your install script. As you say further work would be required to get this merged for general use. (Not a full review) Some initial things that that stand out to me as being needed before we can thank about merging it:

• Added to the documentation
• Moved into the scripts folder and renamed to distinguish it from scripts/setup_test_cluster.sh (scripts/setup_k3s_and_install.sh?)
• Needs to handle matrixRTC given that's now in the quick setup values files since this PR was created
• How safe is the script to re-run, appreciating that while you've got y/N around various steps, people will still blindly hit y?
• Implementing the individual certs case would be good
  • This might be easier using yq rather than sed
• I don't think there's anything much to do for the external reverse proxy setup so not bailing out would be good