Move NixOS switches to SSH runners

.gitea/workflows/nixos-switch-mini-pc.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   switch:
-    runs-on: mini-pc-nixos
+    runs-on: mini-pc
     steps:
       - name: Sync repo
         run: |
@@ -20,4 +20,13 @@ jobs:
           git -C /opt/services pull --ff-only
 
       - name: Switch NixOS generation
-        run: sudo /run/current-system/sw/bin/nixos-rebuild switch --flake /opt/services/nixos#mini-pc
+        env:
+          NIXOS_DEPLOY_KEY: ${{ secrets.NIXOS_DEPLOY_KEY }}
+        run: |
+          KEY=$(mktemp)
+          echo "$NIXOS_DEPLOY_KEY" > "$KEY"
+          chmod 600 "$KEY"
+          trap "rm -f $KEY" EXIT
+          ssh -i "$KEY" -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
+            ada@192.168.1.10 \
+            "sudo /run/current-system/sw/bin/nixos-rebuild switch --flake /opt/services/nixos#mini-pc"