[BB-173] SSH config folder documentation

[Franr]

What?

• Describe high-level what changed as a result of these commits (i.e. in plain-english, what do these changes mean?)
• Use bullet points to be concise and to the point.

Why?

• Provide the justifications for the changes (e.g. business case).
• Describe why these changes were made (e.g. why do these commits fix the problem?)
• Use bullet points to be concise and to the point.

References

binbashar/leverage#173
binbashar/leverage#213

[exequielrafaela]

@Franr Let's add this consideration if possible.

$ leverage terraform init
...
Downloading git::ssh://git@github.com/binbashar/terraform-aws-natgw-notifications-test.git for vpc-natgw-notifications...
Warning: the ECDSA host key for 'github.com' differs from the key for the IP address '20.201.28.151'
Offending key for IP in /root/.ssh/known_hosts:238
Matching host key in /root/.ssh/known_hosts:242
Are you sure you want to continue connecting (yes/no)? yes
...

To stop getting the SSH RSA (yes/no) confirmation you have to remove the line 238 (github.com ssh-rsa)

╭─    ~/.ssh ········································································ ✔  at 15:52:22 
╰─ cat known_hosts | grep "github.com"
238 github.com ssh-rsa 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
242 github.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg=