ci: prevent gc from deleting

.gitea/workflows/deploy.yml

@@ -24,11 +24,19 @@ jobs:
         run: |
           mkdir -p /var/lib/dotfiles-deploy
           readlink -f result > /var/lib/dotfiles-deploy/yarn
+          nix-store --add-root /var/lib/dotfiles-deploy/yarn-gcroot -r "$(readlink -f result)"
 
       - name: Build NixOS configuration (mreow)
         run: |
           nix build .#nixosConfigurations.mreow.config.system.build.toplevel -L
 
+      - name: Record mreow store path
+        continue-on-error: true
+        run: |
+          mkdir -p /var/lib/dotfiles-deploy
+          readlink -f result > /var/lib/dotfiles-deploy/mreow
+          nix-store --add-root /var/lib/dotfiles-deploy/mreow-gcroot -r "$(readlink -f result)"
+
       - name: Notify success
         if: success()
         run: |