fix(ci): replace minikube devstack with standalone MinIO container

[npow]

Summary

• Replace the minikube-based metaflow-dev all-up S3 test environment with a lightweight standalone MinIO Docker container
• Skip tests incompatible with MinIO (SSE, non-ASCII filenames)
• Skip heavy parametrizations (5gb_file, 3000_files) that exceed CI timeout
• Pin CI to Python 3.11 with 90min timeout
• Add workflow_dispatch trigger

Extracted from #3148 — these are the MinIO CI changes only, without the boto3 refactor.

Test plan

• Verify metaflow.s3_tests.minio CI workflow passes with the new Docker-based MinIO setup
• Confirm skipped tests are correctly gated on MINIO_TEST env var

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR replaces the minikube-based MinIO devstack with a lightweight standalone Docker container, pins CI to Python 3.11 with a 90-minute timeout, and gates SSE/non-ASCII/heavy-parametrization tests behind MINIO_TEST. The full-stack-test.yml improvements (timeout, teardown guard, failure dump) are clean. The two minor findings are in the SSE fixture and the retry count — both P2 and non-blocking.

Confidence Score: 5/5

Safe to merge; all findings are P2 style suggestions and the known P1s are already tracked in prior review threads

No new P0/P1 findings introduced by this PR beyond the issues already flagged in previous review threads. The SSE duplicate-run and high retry count are minor quality concerns that don't affect correctness.

.github/workflows/metaflow.s3_tests.minio.yml still has open issues from prior threads (untagged image, silent readiness timeout, broken workflow_dispatch) that should be addressed before relying on this workflow in production CI.

Important Files Changed

Filename	Overview
.github/workflows/metaflow.s3_tests.minio.yml	Replaces minikube devstack with a standalone MinIO Docker container; known issues with untagged image, silent readiness-loop timeout, and broken workflow_dispatch are flagged in prior review threads
.github/workflows/full-stack-test.yml	Adds 30-min timeout, extends wait-ready to 900 s, adds debug dump on failure, and ensures teardown always runs — clean improvement
test/data/s3/test_s3.py	SSE fixture returns None for MinIO, causing encryption_settings = [None, None] — tests run twice identically instead of being skipped; functional but wasteful
test/data/s3/test_s3op.py	Correctly gates non-ASCII filename test behind MINIO_TEST env var using pytest.mark.skipif

_{Reviews (2): Last reviewed commit: "ci: retrigger checks" | Re-trigger Greptile}