only sticky disk on blacksmith runners

.github/actions/setup-bun/action.yml

@@ -5,6 +5,7 @@ runs:
   steps:
     - name: Mount Bun Cache
       uses: useblacksmith/stickydisk@v1
+      if: ${{ contains(runner.labels, 'blacksmith') }}
       with:
         key: ${{ github.repository }}-bun-cache-${{ runner.os }}
         path: ~/.bun

.github/workflows/sign-cli.yml

@@ -12,7 +12,7 @@ permissions:
 
 jobs:
   sign-cli:
-    runs-on: blacksmith-4vcpu-ubuntu-2404
+    runs-on: ubuntu-20.24
     if: github.repository == 'anomalyco/opencode'
     steps:
       - uses: actions/checkout@v3