refactor: move entry point to expo as proxy

Dockerfile

@@ -2,8 +2,12 @@ FROM bycedric/expo-cli:3
 
 COPY entrypoint.sh LICENSE.md README.md /
 
+# move the entry point as proxy command for expo itself
+# see: https://github.com/expo/expo-github-action/#automatic-expo-login
+RUN mv entrypoint.sh /usr/local/bin/expo
+
 # increase node's default memory limit to 4gb
 # see: https://github.com/expo/expo-github-action/#overwriting-node_options
 ENV NODE_OPTIONS="--max_old_space_size=4096"
 
-ENTRYPOINT ["/entrypoint.sh"]
+ENTRYPOINT ["/usr/local/bin/expo"]