Indicate requirement for OpenSSH 8.1

Cody Martinrequested to merge
Codym48/gitlab:codym48/openssh-version into master

What does this MR do and why?

Indicate that OpenSSH 8.1 is required to configure git to sign commits with your SSH key.

The existing documentation suggests OpenSSH 8.0 or newer, but when following the instructions and trying to commit, I encounter the error

$ git commit -am"blah"
error: ssh-keygen -Y sign is needed for ssh signing (available in openssh version 8.2p1+)

with

[cmartin3@cmartin3-ws mk1-sil]$ ssh -V
OpenSSH_8.0p1, OpenSSL 1.1.1k  FIPS 25 Mar 2021
[cmartin3@cmartin3-ws mk1-sil]$ cat /etc/os-release 
NAME="CentOS Stream"
VERSION="8"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Stream 8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://centos.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux 8"
REDHAT_SUPPORT_PRODUCT_VERSION="CentOS Stream"

Although the error message in git suggests OpenSSH 8.2, the ssh-keygen -Y argument is mentioned as a new feature in the 8.1 release notes, so point the user there instead.

I haven't updated to and tested with OpenSSH 8.1 or 8.2 specifically, but it does work if I update to OpenSSH 8.4, committing successfully and then showing Verified when pushed to the GitLab remote.

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Edited by Cody Martin

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