A few years ago, I had a build that was a bit slow on Github actions. I didn't want to switch to the paid plan just to spin up a worker. Basically we are a bootstrapped company with, at the time, no budget to pay ourselves or for extra stuff like fancy build servers. If you are that kind of company, Github is amazing value.

To solve the problem, I created a simple vm in Google Cloud with a lot of CPU and memory that runs Ubuntu. I installed enough stuff on it to be able to check out code and run our build script (a jvm and gradle basically). And then I modified the Github action to 1) start the vm, 2) trigger the build script via ssh 3) pause the vm so we don't get billed for it. That vm runs for maybe an hour per month or so. It would probably cost us hundreds of euros per month if we ran it 24/7. But 1/3600th of that barely registers on our bills. And it's nice and fast.

This has been working flawlessly for a few years now. The Github action takes about 3 minutes. That includes starting the vm, running the script, and shutting the vm down again.

Wonky in a way. But also simple and robust enough. People over engineer/over think this stuff for the wrong reasons. For example, I could of course automate the provisioning of that vm. But I haven't. Because I only ever touch it once a year or so to run a quick apt-get update. I rebuilt it a few weeks ago in a different region. That was like a 20 minute job. Terraform or Ansible for vms you only create once every few years is redundant and might take more time than you would save. I can always do that when that stops being true.

I've been running this startup on the freemium layer in Github for five years now. It's great as a free service. I would actually pay for it if I needed to. I did actually pay for it before MS acquired Github in a previous startup when business usage wasn't free. But so far, there's no need for me to do that. I also run some monitoring scripts as Github actions. Simple curl jobs against our servers that trigger alerts when they fail. That has to run somewhere. It might as well be Github actions. But if/when that becomes inconvenient, I can improvise other solutions.