Introduce KUBESEAL_VERSION for Linux installation (#1275) #1605

Job	Run time
Load versions.env	5s
Run gosec (1.20.3, ubuntu-latest, 2.15.0)	2m 42s
Build (1.20.3, macos-latest, 1.8.1)	3m 9s
Build (1.20.3, windows-latest, 1.8.1)	3m 45s
Build (1.20.3, ubuntu-latest, 1.8.1)	2m 17s
Build Container	2m 30s
Run linters (1.20.3, ubuntu-latest, 1.52.2)	3m 33s
Integration (controller.yaml) (1.24.15)	7m 10s
Integration (controller.yaml) (1.25.11)	6m 2s
Integration (controller.yaml) (1.26.6)	6m 48s
Integration (controller.yaml) (1.27.3)	5m 53s
Integration (Helm Chart) (1.24.15)	5m 4s
Integration (Helm Chart) (1.25.11)	5m 0s
Integration (Helm Chart) (1.26.6)	6m 50s
Integration (Helm Chart) (1.27.3)	5m 59s
	1h 6m 47s

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