centos7_docker_image_updater failing on RISC-V

Ref: https://ci.adoptium.net/job/centos7_docker_image_updater/504/execution/node/89/log/

```
+ docker build -t adoptopenjdk/ubuntu2004_build_image:linux-riscv64 --build-arg git_sha=2a029fd406c6f35f70c32ef5a814933fa11297ee -f ansible/docker/Dockerfile.Ubuntu2004-riscv64 .
ERROR: permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/_ping": dial unix /var/run/docker.sock: connect: permission denied
```
Runs on `docker&&linux&&riscv64` and has selected [Scaleway machine 1](https://ci.adoptium.net/computer/test%2Drise%2Dubuntu2310%2Driscv64%2D1) for that particular run

Start with the linked CI execution log for centos7_docker_image_updater and inspect the Docker build command using ansible/docker/Dockerfile.Ubuntu2004-riscv64. Check the selected Scaleway RISC-V machine's Docker access and compare the reported socket permission failure with the job's expected setup. Done means the updater can run its Docker build successfully on that machine.

Written by the indexing model from the issue text.