refactor release workflow #1692

Job	Run time
build-rqlite	5s
generate-tag	4s
build-minio	10s
image-deps-updater	15s
build-dex	5s
kurl-addon-changes-filter	4s
build-kotsadm-migrations	18s
build-kotsadm	4m 44s
build-kurl-proxy	3m 9s
build-web	2m 34s
Run regression testing	2s
generate-kots-release-notes-pr	0s
build-kots	2m 0s
goreleaser	0s
build-release	1s
generate-kurl-addon	1s
build-airgap	1s
publish-kurl-addon	1s
regression-test	1s
validate-kurl-addon	1s
	13m 36s

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