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AppImage does not work due to trying to modify its read-only filesystem

See original GitHub issue

Description

Running the AppImage starts up a browser window, but it can’t connect to the backend because the server appears to crash. The server crashes because it tries to create ./sessions, but I guess it is inside the read-only AppImage filesystem when it does that and the attempt to make the directory fails.

Gtk-Message: Failed to load module "overlay-scrollbar"
2018-04-28T03:10:23.628Z - info: init Loading configuration from "/z/home/anovak/.cncrc"
Error: EROFS: read-only file system, mkdir './sessions'
    at Object.fs.mkdirSync (fs.js:891:18)
    at appMain (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/app/index.js:10595:22)
    at server (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/app/index.js:7316:38)
    at /tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/dist/app/app.multihost.js:132:25
    at Array.forEach (<anonymous>)
    at Object.appMain [as default] (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/dist/app/app.multihost.js:97:31)
    at createServer (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/dist/app/server.js:62:49)
    at serverMain (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/dist/app/server.js:114:9)
    at createServer (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/dist/app/index.js:57:33)
    at module.exports (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/index.js:13:12)
    at Object.createServer (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/app/index.js:7320:32)
    at /tmp/.mount_cncjs-gAlZxJ/app/resources/app/cnc.js:100:26
    at Promise (<anonymous>)
    at F (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/core-js/library/modules/_export.js:35:28)
    at cnc (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/cnc.js:96:12)
    at _callee$ (/tmp/.mount_cncjs-gAlZxJ/app/resources/app/main.js:94:50)
2018-04-28T03:10:24.050Z - error: The multi-host server does not exist: {
    "type": "server",
    "route": "/"
}     at /tmp/.mount_cncjs-gAlZxJ/app/resources/app/node_modules/webappengine/dist/app/app.multihost.js:138:27 id=0, pid=22251
2018-04-28T03:10:24.077Z - info: init Starting the server at http://127.0.0.1:46779