Make woodpecker config work again

.woodpecker/deploy.yaml

@@ -7,34 +7,25 @@ variables: &nix-config
     NIXPKGS_ALLOW_INSECURE: "1"
 
 steps:
-  - name: Configure Nix Channels
+  - name: Check Flake
-    image: bash
+    image: nixos/nix:latest
+    pull: true
     commands:
       - nix-channel --add https://nixos.org/channels/nixos-$${NIXOS_VERSION} nixos
       - nix-channel --update
-    environment:
-      *nix-config
-    when:
-      - evaluate: 'CI_PIPELINE_EVENT != "cron" && CI_PIPELINE_EVENT != "schedule"'
-
-  - name: Check Flake
-    image: bash
-    commands:
       - nix flake check
     environment:
       *nix-config
     when:
       - evaluate: 'CI_PIPELINE_EVENT != "cron" && CI_PIPELINE_EVENT != "schedule"'
 
-  - name: Place SSH Key
-    image: bash
-    commands:
-      - echo $${SSH_PRIVATE_KEY}} > .privkey
-      - chmod 0600 .privkey
-
   - name: Deploy
-    image: bash
+    image: nixos/nix:latest
+    pull: true
     commands:
+      - nix-env -iA nixos.openssh
+      - eval "$(ssh-agent -s)"
+      - echo $${SSH_PRIVATE_KEY}} | ssh-add -
       - nix develop --command deploy
     environment:
       *nix-config