fix: Make publish-all script compatible with Bourne Shell

publish-all.sh

@@ -1,6 +1,8 @@
-pushd tweed5 || exit
+#!/usr/bin/env sh
+
+cd tweed5 || exit
 ../gradlew publish
-popd || exit
+cd .. || exit
-pushd tweed5-minecraft || exit
+cd tweed5-minecraft || exit
 ./helpers/run-each-mc.sh ../gradlew publish
-popd || exit
+cd .. || exit