It's quite inconvenient to extend LuaJIT integration workflow now: one
needs to patch GitHub workflow file in Tarantool repository and then
setup integration testing in LuaJIT repository.

This patch introduces a new workflow parameter that can replace several
existing parameters (e.g. buildtype and GC64) and allow to easy extend
integration CI in LuaJIT (with rare little touches in Tarantool).

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

Reviewed-by: Sergey Kaplun <skaplun@tarantool.org>
Reviewed-by: Yaroslav Lobankov <y.lobankov@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>
(cherry picked from commit 98fcd437)