Pinning of `test/container/Dockerfile` container images by digest hashes

[adamiBs]

Summary

In accordance with #12618 (comment), This is an issue for the tracking of our move to digest hashes instead of images tags.

Motivation

This would increase future predictability of the Dockerfile's behavior by providing an immutable digest for each image instead of mutable tags

Proposal

By execution of Crane commands in order to retrieve the image digests (Thanks to @34fathombelow for the explanation):

$ crane digest docker.io/library/redis:7.0.5
sha256:dfeb5451fce377ab47c5bb6b6826592eea534279354bbfc3890c0b5e9b57c763
$ crane digest docker.io/library/node:12.18.4-buster
sha256:7f4090a3fea631e703f4afe5cc5504143970d669a2c13b4e5edf3f830c9b4c96
$ crane digest docker.io/library/golang:1.19
sha256:7ce31d15a3a4dbf20446cccffa4020d3a2974ad2287d96123f55caf22c7adb71
$ crane digest docker.io/library/registry:2.8
sha256:3f71055ad7c41728e381190fee5c4cf9b8f7725839dcf5c0fe3e5e20dc5db1fa
$ crane digest docker.io/bitnami/kubectl:1.26
sha256:625467eb8c3a3d60232923404941c32e787eb9003e644d0fa8258b0efa7f6a7f
$ crane digest ubuntu:22.04
sha256:9a0bdde4188b896a372804be2384015e90e3f84906b750c1a53539b585fbbe7f