tarantool/tarantool 3.0.1 image is not convenient to use in ci due to TT_INSTANCE_NAME and TT_APP env variables

[ochaton]

I use lots of docker images of tarantool/tarantool in CI and github workflows to test libraries with tarantool/luacheck, tarantool/luatest, luacov and so on. They all are installed during CI jobs and have /usr/bin/env tarantool as executable.

Since 3.0.0 when environment variables TT_INSTANCE_NAME and/or (don't know exactly) TT_APP are set, tarantool jumps into DB, and that is not OK.

Now I use this hack, to wipe out TT_* environment variables from docker images, maybe you could suggest something better?

for f in $(env | grep TT | while read -r line; do cut -f1 -d'=' ; done); do unset $f; done