Suggestion to implement GitHub Actions

[andyundso]

The last feedback on #14 was that multi-arch images would be desired. This PR contains a GitHub Actions configuration that can build a multi-arch version of the pgautoupgrade container. In a nutshell:

• To optimise resources, each version of Postgres from which an upgrade should be possible gets its own build job. Generally, the ARM build is done with QEMU, so compile-times of 25 minutes are usual. So the previous sequential approach did not scale. Subsequent runs of this build step should be cached.
• Then each final version (v13 to v16) gets build, tested and pushed.

Example workflow run and result on my Docker Hub page.

At this point, I would consider this a WIP, as the following points need to be clarified.

1. I renamed the image name to simpliandy/pgautoupgrade to test things, this needs to be reverted.
2. I would recommend to always push an image when pushing / merging to main. The -dev could be pushed when manually starting a run of the workflow from any branch not named main.
3. To optimise image size, separate stages for each final version (v13 to v16) could be introduced.
4. Credentials to log into Docker Hub need to be added.
5. I did not adapt anything in the Makefile yet. However, I assume I broke it since I adapted the test.sh file.

[justinclift]

Yeah, that's a better approach rather than my copy-and-edit one so far. 😄

[justinclift]

Cool! Looks like you're putting solid time and effort into getting that working @andyundso.

If I send you a team invite so you can do stuff in the repo directly, would that be useful?

I'm thinking it'll let you make changes to get things working without me needing to be a gatekeeper (I'm kind of knocking myself out on another project atm 😉).

---

Actually, I just sent an invite anyway so feel free to accept it if it's of interest. 😄

[justinclift]

@ateuber @dtcooper @wuast94 Anyone have time to review this? 😄

[wuast94]

had a look and thanks for this awesome work 😊 looks fine to me so far

overall it could be an option to use github instead of dockerhub

if using Dockerhub @justinclift you need to enter your Dockerhub credentials in this repo.

[justinclift]

@wuast94 Thanks. I've just added a DOCKERHUB_USERNAME variable and DOCKERHUB_PASSWORD secret to the organisation settings, so things can be done with the Docker Hub repo. 😄

[andyundso]

thanks for the feedback, I also accepted the invite for the organization.

I'll create a new branch directly in the repository to address the remaining points.

[dtcooper]

It appears the Postgres base container supports all of the following architectures: linux/amd64, linux/arm32v5, linux/arm32v6, linux/arm32v7, linux/arm64v8, linux/i386, linux/mips64le, linux/ppc64le, and linux/s390x... so why not go buck wild and support them all? :)

[justinclift]

I guess we might as well give it a shot and see how it goes.

@andyundso You up for that? (maybe later, after you're happy with the other bits? 😄)

[dtcooper]

Looks fantastic to me! Thanks for doing this. :)

[andyundso]

replaced by #26.