docker/vttestserver/run.sh: Add $CHARSET environment variable #7970
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Description
This adds an environment variable to pass through to vttestserver's
-charset
command-line flag, and defaults it toutf8mb4
. This, among other things, enables a portion Prisma's integration test suite that validates certain Unicode support.Related Issue(s)
#7942
Checklist
Deployment Notes
This only changes the vttestserver containers. @harshit-gangal mentioned in #7942 making it the default in vttablet. This PR does not do that, so I don't disagree with leaving that issue open if we consider that a requirement.