(self-hosting|2): add minio for local file uploads #2138

Job	Run time
build-all / Emit container tag sha	2s
ci / ci	2m 56s
build-all / build-core / Build	6m 20s
build-all / build-base / Build	2m 49s
build-all / build-jobs / Build	1m 44s
e2e / Integration tests	7m 57s
	21m 48s

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