GitHub Linux ARM64 hosted runners now available for free in public repositories

While this is great, for people claiming they can now built multi-arch images without emulation, how are you planning on doing so? As far as I know, if you want to build multi-arch images on native runners for each platform, you basically need to:

* Configure a workflow with 1 job for each arch, each building a standalone single-arch image, tagging it with a unique tag, and pushing each to your registry

* Configure another job which runs at the completion of the previous jobs that creates a combined manifest containing each image using `docker manifest create`.

Basically, doing the steps listed in https://www.docker.com/blog/multi-arch-build-and-images-the-... under "The hard way with docker manifest ".

Does anyone have a better approach, or some reusable workflows/GHA that make this process simpler? I know about Depot.dev which basically abstracts the runners away and handles all of this for you, but I don't see a good way to do this yourself without GitHub offering some better abstraction for building docker images.

Edit: I just noticed https://news.ycombinator.com/item?id=42729529 which has a great example of exactly these steps (and I just realized you can just push the digests, instead of tags too, which is nice).

This is exciting to see as arm64 is really a growing space, as we've seen since first launching our Docker image build acceleration [0]. Free for public repos is definitely a strong pull if you can live with some of the quirks.

Even with this, building multi-platform Docker images with fast persistent caching in GitHub Actions will still be slow in the worst case and tedious in the best case.

We've also expanded into GitHub Actions runners, bringing our fast caching and faster compute into the actual runner.

We've done some cool things like making caching and disk access faster using ramdisks, Ceph, and blob storage [1]. We're offering Intel, ARM, and macOS runners at half the cost of what GitHub offers to private repos. We're also focused on accelerating even more builds outside of the runner. [2]

[0] https://depot.dev/products/container-builds

[1] https://depot.dev/blog/introducing-github-actions-ultra-runn...

[2] https://depot.dev/blog/introducing-depot-cache

This is excellent news, as it should unblock having precompiled packages available for a number of applications for arm64—for me, most notably, OpenZFS: https://github.com/openzfs/zfs/issues/14511

Here's a quick example I put together on how to use these runners to accelerate docker builds: https://github.com/gartnera/actions-arm64-native-example

For cheaper (for private repos) and faster arm64 runners, check out what we're making at WarpBuild.

We also support spinning up self-hosted runners on your AWS/gcp/azure in just a couple of clicks.

We're using Go, so cross-compilation has never been a big problem (for producing artifacts). But this'll be great for testing on ARM. I'm interested to see the performance of these instances too - our experience has been that Amazon's Graviton processors have fantastic bang-for-buck vs. Intel/AMD.

This is awesome!!!

I switched from an Intel Mac to an Apple Silicon Mac a few months ago, and have been trying to do as much stuff as possible on ARM.

One thing this should do, is make people think more about switching their cloud-based workflows to ARM CPUs, which are generally less expensive.

For private repos, Github runners are slow and overpriced. We switched to buildjet.com runners and have no regrets.

Our CI runners live on a box in the corner of the office and their only operating cost is my time.

Paying someone for CI compute seems insane. The load is so variable that you never know if your monthly bill will be zero or several hundred/thousand dollars. I especially don't want my employees to consider that each and every push costs the company a nonzero amount of money. CI should be totally free and unrestricted. If a new employee has a really bad day and fires off a hundred CI runs (as we all have), I don't want to explain to accounting why there's an enormous spike in the bill.

It costs us a couple of my salaried hours a month to maintain our on-site infra. Far, far less than our present AWS bill. Most months it needs no attention. It just sits there and does its job. Hell, it's even solar powered.

This is awesome, I have been dealing with weird errors in GHA for years when having to emulate for multi arch builds

Nice. I had gone looking for this a week or two ago and was surprised it wasn’t available to me.