nix on ubuntu?

.forgejo/workflows/build-image.yml

@@ -1,42 +1,53 @@
-name: Build and Upload NixOS Image
+name: "Build NixOS Image"
 
 on:
   workflow_dispatch:
 
 jobs:
   build:
-    runs-on: [nixos]
+    runs-on: ubuntu-latest
+
     defaults:
       run:
         working-directory: nixos
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          extra_nix_config: |
+            experimental-features = nix-command flakes
 
       - name: Build NixOS image
         run: nix build .#nixosImage
 
-      - name: Upload image to Proxmox
+      - name: Upload & Restore to Proxmox
         env:
-          SSH_KEY: ${{ secrets.PROXMOX_SSH_KEY }}
-          PROXMOX_USER: root
+          PROXMOX_SSH_KEY: ${{ secrets.PROXMOX_SSH_KEY }}
           PROXMOX_HOST: 192.168.1.205
+          PROXMOX_USER: root
         run: |
-          mkdir -p ~/.ssh
-          echo "$SSH_KEY" > ~/.ssh/id_proxmox
-          chmod 600 ~/.ssh/id_proxmox
-          export SSH="ssh -i ~/.ssh/id_proxmox -o StrictHostKeyChecking=no"
-          export SCP="scp -i ~/.ssh/id_proxmox -o StrictHostKeyChecking=no"
+          set -e
 
-          IMAGE=$(find result/ -name '*.vma.zst' | head -n 1)
-          NAME=$(basename "$IMAGE")
+          IMAGE_NAME="vm-image.vma.zst"
+          REMOTE_PATH="/var/lib/vz/template/$IMAGE_NAME"
+          VM_ID="9000"
 
-          echo "Uploading $IMAGE to $PROXMOX_HOST..."
-          $SCP "$IMAGE" "$PROXMOX_USER@$PROXMOX_HOST:/var/lib/vz/dump/"
+          echo "Starting ssh-agent and uploading..."
+          eval "$(ssh-agent -s)"
+          ssh-add <(echo "$PROXMOX_SSH_KEY")
 
-          echo "Restoring and converting to template..."
-          $SSH "$PROXMOX_USER@$PROXMOX_HOST" "
-            qmrestore /var/lib/vz/dump/$NAME 9000 --unique --replace &&
-            qm template 9000
+          echo "Uploading image..."
+          scp -o StrictHostKeyChecking=no ./result/$IMAGE_NAME $PROXMOX_USER@$PROXMOX_HOST:$REMOTE_PATH
+
+          echo "Restoring VM $VM_ID..."
+          ssh -o StrictHostKeyChecking=no $PROXMOX_USER@$PROXMOX_HOST "
+            qm stop $VM_ID || true
+            qm destroy $VM_ID || true
+            qmrestore --unique $REMOTE_PATH $VM_ID
+            qm template $VM_ID
           "

nixos/hosts/forgejo-runner/runner.nix

@@ -20,7 +20,6 @@
         # "ubuntu-22.04:docker://node:16-bullseye"
         # "ubuntu-20.04:docker://node:16-bullseye"
         # "ubuntu-18.04:docker://node:16-buster"
-        "nixos:docker://cachix/nix-build-action"
         ## optionally provide native execution on the host:
         # "native:host"
       ];