Fix CI test workflow

utils/test/run.sh

@@ -1,19 +1,19 @@
 #!/bin/bash -e
-world=$(mktemp -d)
-trap 'rm -rf "$world" || :' EXIT
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir" || :' EXIT
 
 [ -f game.conf ] || { echo "Must be run in game root folder." >&2; exit 1; }
 [ -n "$DOCKER_IMAGE" ] || { echo "Specify a docker image." >&2; exit 1; }
 
-chmod -R 777 "$world" # container uses unprivileged user inside
+mkdir -p "$tmpdir/world"
+chmod -R 777 "$tmpdir" # container uses unprivileged user inside
 
 vol=(
 	-v "$PWD/utils/test/minetest.conf":/etc/minetest/minetest.conf
-	--tmpfs /var/lib/minetest/.minetest
+	-v "$tmpdir":/var/lib/minetest/.minetest
 	-v "$PWD":/var/lib/minetest/.minetest/games/minetest_game
-	-v "$world":/var/lib/minetest/.minetest/world
 )
 docker run --rm -i "${vol[@]}" "$DOCKER_IMAGE" --config /etc/minetest/minetest.conf --gameid minetest
 
-test -f "$world/map.sqlite" || exit 1
+test -f "$tmpdir/world/map.sqlite" || exit 1
 exit 0