I recommend https://happy.engineering/ . It is very easy to set up. I can have an instance in a container which contains my repository and lots of packages/binaries necessary for the work. I can then use the different binaries to run commands in the container. I was able to easily do `ls -la` in the container and email that to myself, all done from my phone. You can also connect it to applescript and whatnot in order to send sms messages, or you can connect to whatsapp. I was able to make it extract the top 5 headlines on hacker news, get the top ideas being discussed in the comments for each submission, and send all of that into my Apple Reminders for me to read on my phone.

No VPN needed.