Expose SQL Connection Options in docker template

[shawnhathaway]

What changed?

• Expose SQL Connection Options in docker template
• Note MySQL did not have any values set here previously

Why?
Should be user configurable.

How did you test it?
No testing, looking at buildkite and pipeline stabilization.

Potential risks
Connection starvation

[markmark206]

i didn't test this, and didn't verify that the values get picked up by the server, but otherwise the changes look good to me.

note that our helm chart don't currently use config_template.yaml, they generate config files "manually", so if we want systems deployed with helm charts to have access to this, that code needs to be updated as well.
https://github.com/temporalio/helm-charts/blob/3e59a5230768972e50fed8834ba4d1377a0dc8fe/templates/server-configmap.yaml#L94