Using deployer with github actions to deploy private repository - github-actions

Question

I'm trying to deploy a PHP Project using github action
The connection on the target server works but I'm stuck at the part when deployer tries to clone the repository.
I'm storing a private ssh key in the github secret in order to access the server and I try to use the same ssh key to access the github repository (the key is added in the deploy key of the repository).
Here the command that fails :
cd {releasePath} && (/usr/bin/git clone -b "develop" --recursive git#github.com:arnaudschaeffer/myprivaterepo.git {releasePath} /releases/3 2>&1)
Command failed with exit code 1: bin/dep deploy staging -vvv
Deployer works from my local environment. I can make it work with both my personnal SSH Keys and the one I've had in a secret in order to connect to the target server.
Here's my github yml file :
# This is a basic workflow to help you get started with Actions
name: Deploy develop
# Controls when the action will run.
on:
# Triggers the workflow on push or pull request events but only for the main branch
push:
branches: [ develop ]
# Allows you to run this workflow manually from the Actions tab
workflow_dispatch:
# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
deploy:
name: Deploy to develop
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout#v2
with:
ref: 'develop'
ssh-key: ${{ secrets.SSH_PRIVATE_KEY }}
persist-credentials: true
- name: Setup PHP
uses: shivammathur/setup-php#v2
with:
php-version: 7.4
- name: Configure SSH
env:
SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
SSH_HOST: ${{ secrets.SSH_HOST }}
SSH_USER: ${{ secrets.SSH_USER }}
SSH_PORT: ${{ secrets.SSH_PORT }}
run: |
mkdir -p ~/.ssh/
echo "$SSH_PRIVATE_KEY" > ~/.ssh/staging.key
chmod 600 ~/.ssh/staging.key
cat >>~/.ssh/config <<END
Host github
Hostname github.com
IdentityFile ~/.ssh/staging.key
IdentitiesOnly yes
Host host_name
HostName $SSH_HOST
User $SSH_USER
Port $SSH_PORT
IdentityFile ~/.ssh/staging.key
StrictHostKeyChecking no
END
- name: Set Up Deployer
run: |
curl -LO https://deployer.org/deployer.phar && mkdir bin && mv deployer.phar bin/dep && sudo chmod +x bin/dep
# Add deploy key in GitHub account
- name: Deploy
uses: deployphp/action#master
with:
private-key: ${{ secrets.SSH_PRIVATE_KEY }}
#Both target server and github known hosts
known-hosts: ${{ secrets.KNOWN_HOSTS }}
dep: deploy staging -vvv
Is there some extra step to clone the repository in deployer ?
Thank in advance !