Add plugin registry (#5467) #1305

Job	Run time
artifacts (ghcr.io/pipe-cd, helloworld)	6m 45s
artifacts (ghcr.io/pipe-cd, launcher)	8m 46s
artifacts (ghcr.io/pipe-cd, launcher-okd)	8m 43s
artifacts (ghcr.io/pipe-cd, pipecd)	20m 17s
artifacts (ghcr.io/pipe-cd, piped)	19m 11s
artifacts (ghcr.io/pipe-cd, piped-okd)	18m 57s
artifacts (ghcr.io/pipe-cd, pipectl)	7m 16s
artifacts (gcr.io/pipecd, helloworld)	7m 3s
artifacts (gcr.io/pipecd, launcher)	8m 50s
artifacts (gcr.io/pipecd, piped)	19m 6s
release-quickstart-manifests	0s
	2h 4m 54s

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