run ssh commands thru the shell (which has openssh)

Reviewed-on: Fediversity/Fediversity#460
Reviewed-by: Valentin Gagarin <valentin.gagarin@tweag.io>
Co-authored-by: Kiara Grouwstra <kiara@procolix.eu>
Co-committed-by: Kiara Grouwstra <kiara@procolix.eu>

.forgejo/workflows/cd.yaml

@@ -13,12 +13,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Set up SSH key to access age secrets
+      - name: Set up SSH key for age secrets and SSH
         run: |
           env
           mkdir -p ~/.ssh
           echo "${{ secrets.CD_SSH_KEY }}" > ~/.ssh/id_ed25519
           chmod 600 ~/.ssh/id_ed25519
+          nix-shell --run 'eval "$(ssh-agent -s)"'
+          nix-shell --run 'ssh-add ~/.ssh/id_ed25519'
 
       - name: Deploy
         run: nix-shell --run 'nixops4 apply default'

infra/common/resource.nix

@@ -58,6 +58,8 @@ in
     users.users.root.openssh.authorizedKeys.keys = attrValues keys.contributors ++ [
       # allow our panel vm access to the test machines
       keys.panel
+      # allow continuous deployment access
+      keys.cd
     ];
 
   };