Merge pull request #580 from fluxcd/install-image-controllers

.github/workflows/update.yml

cmd/flux/bootstrap.go

cmd/flux/bootstrap_github.go

cmd/flux/bootstrap_gitlab.go

cmd/flux/install.go

docs/cmd/flux_bootstrap.md

docs/cmd/flux_bootstrap_github.md

docs/cmd/flux_bootstrap_gitlab.md

docs/cmd/flux_install.md

...ests/bases/image-automation-controller/kustomization.yaml

manifests/bases/image-automation-controller/patch.yaml

...fests/bases/image-reflector-controller/kustomization.yaml

manifests/bases/image-reflector-controller/patch.yaml

manifests/install/kustomization.yaml