Implement bootstrap package in commands

This includes making a lot of things configurable (e.g. SSH key
algorithm, RSA bit size, etc.) that used to be static.

Signed-off-by: Hidde Beydals <hello@hidde.co>

go.sum

@@ -204,8 +204,6 @@ github.com/fluxcd/pkg/apis/kustomize v0.0.1 h1:TkA80R0GopRY27VJqzKyS6ifiKIAfwBd7
 github.com/fluxcd/pkg/apis/kustomize v0.0.1/go.mod h1:JAFPfnRmcrAoG1gNiA8kmEXsnOBuDyZ/F5X4DAQcVV0=
 github.com/fluxcd/pkg/apis/meta v0.8.0 h1:wqWpUsxhKHB1ZztcvOz+vnyhdKW9cWmjFp8Vci/XOdk=
 github.com/fluxcd/pkg/apis/meta v0.8.0/go.mod h1:yHuY8kyGHYz22I0jQzqMMGCcHViuzC/WPdo9Gisk8Po=
-github.com/fluxcd/pkg/git v0.3.0 h1:nrKZWZ/ymDevud3Wf1LEieO/QcNPnqz1/MrkZBFcg9o=
-github.com/fluxcd/pkg/git v0.3.0/go.mod h1:ZwG0iLOqNSyNw6lsPIAO+v6+BqqCXyV+r1Oq6Lm+slg=
 github.com/fluxcd/pkg/runtime v0.10.1 h1:NV0pe6lFzodKBIz0dT3xkoR0wJnTCicXwM/v/d5T0+Y=
 github.com/fluxcd/pkg/runtime v0.10.1/go.mod h1:JD0eZIn5xkTeHHQUWXSqJPIh/ecO0d0qrUKbSVHnpnw=
 github.com/fluxcd/pkg/ssh v0.0.5 h1:rnbFZ7voy2JBlUfMbfyqArX2FYaLNpDhccGFC3qW83A=
@@ -389,8 +387,6 @@ github.com/google/go-containerregistry v0.2.0 h1:cWFYx+kOkKdyOET0pcp7GMCmxj7da40
 github.com/google/go-containerregistry v0.2.0/go.mod h1:Ts3Wioz1r5ayWx8sS6vLcWltWcM1aqFjd/eVrkFhrWM=
 github.com/google/go-github/v32 v32.1.0 h1:GWkQOdXqviCPx7Q7Fj+KyPoGm4SwHRh8rheoPhd27II=
 github.com/google/go-github/v32 v32.1.0/go.mod h1:rIEpZD9CTDQwDK9GDrtMTycQNA4JU3qBsCizh3q2WCI=
-github.com/google/go-github/v33 v33.0.0 h1:qAf9yP0qc54ufQxzwv+u9H0tiVOnPJxo0lI/JXqw3ZM=
-github.com/google/go-github/v33 v33.0.0/go.mod h1:GMdDnVZY/2TsWgp/lkYnpSAh6TrzhANBBwm6k6TTEXg=
 github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/gofuzz v0.0.0-20161122191042-44d81051d367/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=