Publish Docker images for ARM

[ngosang]

You don't need to make changes in your code, just build the Docker images in a different way.

Manual multi-arch build:

docker buildx create --use
docker buildx build -t sapcc/mosquitto-exporter:0.8.0 --platform linux/386,linux/amd64,linux/arm/v5,linux/arm/v7,linux/arm64/v8,linux/mips64le,linux/ppc64le,linux/s390x .

# add --push to publish to DockerHub

Automate Docker build and publishing with GitHub actions:
https://github.com/FlareSolverr/FlareSolverr/blob/master/.github/workflows/release-docker.yml

[dannysauer]

I just installed https://github.com/jryberg/mosquitto-exporter on a Raspberry Pi cluster. It seems to be an actual somewhat-maintained (uses renovate to keep deps updated!) fork built for multi-arch, so I'd be inclined to suggest heading off over there. Note that the container image tags start with "v", which I completely ignored until it didn't work without them. 🤦🤣