Add secret detection

https://docs.gitlab.com/ee/user/application_security/secret_detection/pipeline/index.html

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

README.md

@@ -25,7 +25,7 @@ The below installation example is for a fresh `eirene-vm` virtual machine.
    ```sh
    mkdir -p /mnt/persist/etc/ssh
    ssh-keygen -t ed25519 -f /mnt/persist/etc/ssh/ssh_host_ed25519_key
-   cp /mnt/persist/etc/ssh/ssh_host_ed25519_key /host/hosts/eirene/vm/secrets/ssh_host_ed25519_key
+   cp /mnt/persist/etc/ssh/ssh_host_ed25519_key /host/hosts/eirene/secrets/ssh_host_ed25519_key
    ```
 
 4. Update `sops` Configuration
@@ -49,18 +49,18 @@ The below installation example is for a fresh `eirene-vm` virtual machine.
 
    - Known Hosts
 
-   ```sh
-   # Add to hosts/common/default.nix.programs.ssh.knownHosts
-   cp /mnt/persist/etc/ssh/ssh_host_ed25519_key.pub /host/hosts/eirene/vm/secrets/ssh_host_ed25519_key.pub
-   ```
+     ```sh
+     # Add to hosts/common/default.nix.programs.ssh.knownHosts
+     cp /mnt/persist/etc/ssh/ssh_host_ed25519_key.pub /host/hosts/eirene/secrets/ssh_host_ed25519_key.pub
+     ```
 
    - SSH Keys
 
-   ```sh
-   # Generate a new SSH key pair for every user in the current system for every existing host that will connect to the new host
-   # Add to hosts/eirene/vm/default.nix.users.users.nick.openssh.authorizedKeys.keyFiles
-   ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_eirene-vm_nick
-   ```
+     ```sh
+     # Generate a new SSH key pair for every user that will connect to the newly added user@host combinations
+     # Add to hosts/eirene/default.nix.users.users.nick.openssh.authorizedKeys.keyFiles
+     ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519_eirene_nick
+     ```
 
 6. Install NixOS