Integrate Github Actions with self-hosted runner for ARM64

[steve-chavez]

Problem

Currently I have to manually compile PostgREST for ARM64 on an AWS Ubuntu instance - this has gotten too distracting and tedious.

And the same would have to be done for Docker #1117 (comment).

Proposal

Use Github Actions self-hosted runners to automate building on ARM64.

There's a list of examples in jonico/awesome-runners from where https://github.com/machulav/ec2-github-runner looks exactly what we need.

[steve-chavez]

I was using a custom build for cabal, but looks that nowadays they do offer a binary for aarch64(from https://www.haskell.org/cabal/download.html)

[laurenceisla]

Adapting the commands I used to upload to my repository (latest and v9.0.0 were already in there), the manual process to add the arm64 architecture to the docker repo would be:

Create the dockerfile.

# Dockerfile

FROM arm64v8/ubuntu:focal AS postgrest-arm64

RUN apt-get update -y
RUN apt install libpq-dev zlib1g-dev jq gcc libnuma-dev -y

COPY postgrest /usr/bin/postgrest

EXPOSE 3000

USER 1000

CMD postgrest

Execute the commands.

# Supposing the postgrest arm64 binary and Dockerfile exist in ~/postgrest-bin

cd ~/postgrest-bin

# Build and add to manifest

sudo docker build -t postgrest/postgrest:latest-arm64 .
sudo docker push postgrest/postgrest:latest-arm64
sudo docker manifest create \
postgrest/postgrest:latest \
--amend postgrest/postgrest:latest \
--amend postgrest/postgrest:latest-arm64
sudo docker manifest push postgrest/postgrest:latest

sudo docker build -t postgrest/postgrest:v9.0.0-arm64 .
sudo docker push postgrest/postgrest:v9.0.0-arm64
sudo docker manifest create \
postgrest/postgrest:v9.0.0 \
--amend postgrest/postgrest:v9.0.0 \
--amend postgrest/postgrest:v9.0.0-arm64
sudo docker manifest push postgrest/postgrest:v9.0.0

Maybe using docker buildx build ... is better, but couldn't make it work.

Then delete the v9.0.0-arm64 and latest-arm64 tags from the repo.