s3proxy: add initial e2e tests

[derpsteb]

Context

Followup for #2524.
In comparison to earlier, mino/mint isn't vendored anymore. We now forked mint. The changes to upstream can be seen here: edgelesssys/mint#1.

Proposed change(s)

• Add deploy.sh script to start a job using mint and wait for it's completion. This executes tests inside the cluster.
• Add e2e_s3proxy action that relies on deploy script to execute tests as part of the CI.
• Add target for e2e-test-manual workflow to trigger e2e_s3proxy action.
• Add matrix entry for s3proxy action in weekly and release tests.
• Add clear.sh script to remove left-over buckets from tests.
• Add regexManager for renovate to automatically update mint image.

Additional info

• Testrun 1
• Testrun 2

Checklist

• Update docs
• Add labels (e.g., for changelog category)
• Is PR title adequate for changelog?
• Link to Milestone

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[thomasten]

please also update s3proxy.md for version-2.12 docs

[derpsteb]

Ignoring link checker as the missing page is accessible atm.