[WIP] Add script to clean old images during deploy (#52)

* Initial plan

* Add Docker image cleanup step to deployment workflow

Co-authored-by: PhantomDave <34485699+PhantomDave@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: PhantomDave <34485699+PhantomDave@users.noreply.github.com>

Author: Copilot

.github/workflows/deploy-tailscale.yml

@@ -123,6 +123,11 @@ jobs:
           tailscale ssh "${{ steps.ssh.outputs.target }}" \
             "echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u ${{ github.actor }} --password-stdin"
 
+      - name: Clean up old Docker images
+        run: |
+          tailscale ssh "${{ steps.ssh.outputs.target }}" \
+            "docker system prune -af --filter 'until=24h'"
+
       - name: Pull latest images
         run: |
           tailscale ssh "${{ steps.ssh.outputs.target }}" \