Add env vars for port and address
Add env vars for port and address

Make it possible to pass port and address via
pair of environmental variables TREE_SITTER_PLAYGROUND_PORT
and TREE_SITTER_PLAYGROUND_ADDR, respectively.

Signed-off-by: Pavel Odvody <2375fa63e2908bb2df59f606483a3aa92321db7a@redhat.com>

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