admin: add pre v4.7.3 admin command to create index #95

Job	Run time
Config (quay.io/projectquay/golang:1.20)	23s
Create Release Archive	4m 22s
Create Release Binaries (arm64, linux)	2m 3s
Create Release Binaries (arm64, windows)	1m 41s
Create Release Binaries (amd64, linux)	1m 45s
Create Release Binaries (amd64, windows)	1m 56s
Create Release Binaries (amd64, darwin)	2m 1s
Create Release Binaries (386, linux)	2m 4s
Create Release Binaries (ppc64le, linux)	1m 47s
Create Release Binaries (s390x, linux)	2m 9s
Release	8s
Deploy Documentation	8s
Publish Container	35m 22s
Publish Binaries (arm64, linux)	6s
Publish Binaries (arm64, windows)	10s
Publish Binaries (amd64, linux)	7s
Publish Binaries (amd64, windows)	11s
Publish Binaries (amd64, darwin)	11s
Publish Binaries (386, linux)	5s
Publish Binaries (ppc64le, linux)	8s
Publish Binaries (s390x, linux)	9s
	56m 56s

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