HOST_ARCH missing in OKD SNO installer download command

[ThomasIAm]

This line should contain the HOST_ARCH so the correct installer binary will be downloaded when using an ARM64 installer machine.

openshift-docs/modules/install-sno-generating-the-install-iso-manually.adoc

Line 110 in 023f909

$ curl -L https://github.com/okd-project/okd/releases/download/$OKD_VERSION/openshift-install-linux-$OKD_VERSION.tar.gz -o openshift-install-linux.tar.gz

[openshift-ci]

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