create docker images for armv7

[snpz]

When by #595 pushing images to dockerhub is working again, this fixes #591 and creates an additional docker image for architecture linux/arm/v7.

[gaul]

I know this is outside the scope of your interest but will this also support most 32-bit Raspberry Pis? I believe that only the early ones were v6: https://raspberrypi.stackexchange.com/a/139499

[snpz]

I read a bit more and you are right. Older Raspberrys would not be supported, the newer ones using arm64v8 would because linux/arm64/v8 gets treated like linux/arm64.

I tried adding it in my private repo but unfortunately building fails with Error: buildx failed with: ERROR: failed to solve: eclipse-temurin:11-jre: no match for platform in manifest: not found because the base image does not support armv6.

It could be made a requirement for solving #568 if it is important to you.

[gaul]

Thank you for your contribution @snpz!

[gaul]

As expected this does not work on a Raspberry Pi 4 with 32-bit userland:

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux
pi@raspberrypi:~ $ podman run andrewgaul/s3proxy
{"msg":"exec container process `/opt/s3proxy/run-docker-container.sh`: Exec format error","level":"error","time":"2024-01-14T23:11:59.000167429Z"}

Unless you are interested in investigating a new base image let's just wait for someone who is affected by lack of support to address this.

[snpz]

@gaul
Not quite sure what to make of your output. Aarch64 is another term for those 64-bit armv8 cpus, right?
What kind of architecture would be needed in that situation?

I did some investigation already and it seems everybody has dropped 32-bit Support in newer image versions.

The one that is currently used dropped 32-bit arm completely beginning with version 21 (https://adoptium.net/de/supported-platforms/), Version 17 still has docker images for armv7, but not for v6 (the older Pis).

I did also come across:
Libera runtime container - no arm support at all
OpenJDK deprecated their docker images (they mention some alternatives but they also have no arm images)
Azul Zulu no 32-bit arm support

Maybe the best solution is to use a slim version of an os as base and installing java through the Dockerfile. Still does not clear up which java version to use, but one would not depend on other organizations to provide images supporting (older) architectures while the JRE itself would support them. I'm totally unexperienced with this though and won't be of much help.

[gaul]

@snpz Thanks for investigating. Sorry I mean let's not worry about ARMv6 support for now. If someone is more motivated then they can do this work.