Gitlab CI/CD issue with SSH config file - ssh

Question

I am trying to deploy my first project to my production server. Here is the script for the deployment stage:
deploy_production:
stage: deploy
script:
- 'which ssh-agent || ( apt-get update -y && apt-get install openssh-client -y )'
- eval $(ssh-agent -s)
- ssh-add <(echo "$SSH_PRIVATE_KEY")
- mkdir -p ~/.ssh
- '[[ -f /.dockerenv ]] && echo -e "ssh -p 69" "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
- ./vendor/bin/envoy run deploy
environment:
name: production
when: manual
only:
- main
When I run the stage, I get this error :
[myServer#xxx.xxx.x.x]: /home/php/.ssh/config: line 1: Bad configuration option: ssh
[myServer#xxx.xxx.x.x]: /home/php/.ssh/config: terminating, 1 bad configuration options
[✗] This task did not complete successfully on one of your servers.
Why is it trying to access the SSH on this path :
/home/php/.ssh/config

Answer 1

Why is it trying to access the SSH on this path :
This should be related to the account used by gitlab-ci: it is supposed to look for SSH settings in $HOME/.ssh: display first what $HOME is.
If you look at the official documentation, you will see an SSH setup relies on proper rights associated to SSH folders/files:
efore_script:
##
## Install ssh-agent if not already installed, it is required by Docker.
## (change apt-get to yum if you use an RPM-based image)
##
- 'command -v ssh-agent >/dev/null || ( apt-get update -y && apt-get install openssh-client -y )'
##
## Run ssh-agent (inside the build environment)
##
- eval $(ssh-agent -s)
##
## Add the SSH key stored in SSH_PRIVATE_KEY variable to the agent store
## We're using tr to fix line endings which makes ed25519 keys work
## without extra base64 encoding.
## https://gitlab.com/gitlab-examples/ssh-private-key/issues/1#note_48526556
##
- echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add -
##
## Create the SSH directory and give it the right permissions
##
- mkdir -p ~/.ssh
- chmod 700 ~/.ssh
I mention before a chmod 400 my_private_key if you store a key in ~/.ssh.
And to be safe, I would add a chmod 600 ~/.ssh/config.
The point is: if the rights are to opened, SSH will refuse to operate.