(self-hosting|2): add minio for local file uploads #2156

Job	Run time
build-all / Emit container tag sha	3s
ci / ci	2m 43s
build-all / build-core / Build	6m 5s
build-all / build-jobs / Build	1m 33s
build-all / build-base / Build	2m 49s
e2e / Integration tests	7m 59s
	21m 12s

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