Add KubeOne to package managers

[xmudrii]

We should consider adding KubeOne to the most popular package managers, so it's easy to get KubeOne.

• Add KubeOne to Homebrew package manager #435 Add KubeOne to Homebrew package manager
• Create AUR package for KubeOne #470 Create AUR package for KubeOne
• Distribute a Docker image of KubeOne #473 Distribute a Docker image of KubeOne
• Sign releases with GPG #472 Sign releases with GPG
• Add additional sub commands for packagers #480 Add additional sub commands for packagers

Relevant to #436

[kubermatic-bot]

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/lifecycle stale

[xmudrii]

/remove-lifecycle stale
/lifecycle frozen