WPB-29054: use minio mirror for fake-aws-s3

[lwille]

Porting this Platform change to our own codebase:

https://wearezeta.atlassian.net/browse/WPB-29054
Note: Fixing or replacing the broken fake-aws-s3 chart is not in scope.

Change type

• Fix
• Feature
• Documentation
• Security / Upgrade

Basic information

• THIS CHANGE REQUIRES A DEPLOYMENT PACKAGE RELEASE
• THIS CHANGE REQUIRES A WIRE-DOCS RELEASE

Testing

• I ran/applied the changes myself, in a test environment.
• The CI job attached to this repo will test it for me.

Offline Build CI (label-based)

Add one or more labels to trigger offline builds:

• build-default - Full production build (ansible, terraform, all packages)
• build-dev - WIAB/dev build
• build-wiab-staging - WIAB-staging build
• build-min - Minimal build (fastest, essential charts only)
• build-all - Run all three builds

Note: No builds run by default. Add a label to trigger CI.

Tracking

• I added a new entry in an appropriate subdirectory of changelog.d
• I mentioned this PR in Jira, OR I mentioned the Jira ticket in this PR.
• I mentioned this PR in one of the issues attached to one of our repositories.

Knowledge Transfer

• An Asciinema session is attached to the Jira ticket.

Motivation

The official mc image was pulled from the public quay.io repo, so our build process can't fetch it any more.

Objective

Fix broken build

Reason

Fix broken build by using our own mirror image.