Add multi-platform ARM64/AMD64 Docker image support (#243)

- Add buildAndPushMultiPlatformDockerImage Gradle task that uses
  docker buildx to build and push linux/amd64 and linux/arm64 images
- Wire new task into release, replacing single-arch push tasks
- Add docker/setup-qemu-action@v3 and docker/setup-buildx-action@v3
  to release workflow to enable cross-platform emulation on runners

Closes #242

use new version.

Bump awssdkS3 from 2.40.16 to 2.41.6 (#215)

upgrade gradle to 8.14 (#203)

Bump testContainers from 1.20.4 to 1.20.6 (#176)

Merge branch 'main' of robothy:Robothy/local-s3

use strict RFC-1123-DATE-TIME to format the last-modified header. (#193)

Merge branch 'main' of robothy:Robothy/local-s3

test publish to maven central

Merge branch 'main' of robothy:Robothy/local-s3