How to use Input Secrets to clone multiple repositories in OpenShift's BuildConfig?

Dockerfile

FROM debian

RUN apt-get update -y && \

    # SSH and git binaries are required
    apt-get install -y curl ssh git && \
    
    # Prepare required configurations and directories
    mkdir -p /root/.ssh && \
    git config --global user.name "example" && \
    git config --global user.email "[email protected]" && \
    touch /root/.ssh/known_hosts && \
    
    # We must add our git host to known_hosts file
    ssh-keyscan github.com >> ~/.ssh/known_hosts

# Here is the most important yet tricky part.
# When you add secrets to a BuildConfig with Docker strategy,
# the secrets are being copied over relative to the actual Dockerfile,
# so you would need to ADD/COPY the secrets to docker context (i.e. inside the container)
ADD secrets /etc/secrets

# Since git will use ssh-agent binary we must identify our SSH private key
RUN eval "$(ssh-agent)" && ssh-agent -s && \
    chmod -R 0600 /etc/secrets && \
    ssh-add /etc/secrets/**/* && \
    
    # Use ssh remote to clone as usual
    git clone [email protected]:my-org/my-library.git && \
    ls -lash my-library/ && \
    
    # Do not keep SSH keys inside the image and remove them for better security 
    rm -rf /etc/secrets