Fix caching in PR preview workflow as well

Author: penelopeysm

.github/workflows/preview.yml

@@ -26,25 +26,23 @@ jobs:
         uses: quarto-dev/quarto-actions/setup@v2
 
       - name: Restore cached _freeze folder
-        id: cache-primes-restore
+        id: cache-restore
         uses: actions/cache/restore@v4
         with:
           path: |
             _freeze/
-          key: ${{ runner.os }}-primes-${{ github.run_id }}
-          restore-keys: |
-            ${{ runner.os }}-primes
+          key: ${{ runner.os }}-${{ hashFiles('**/Manifest.toml') }}
 
       - name: Render Quarto site
         run: quarto render
 
       - name: Save _freeze folder
-        id: cache-primes-save
+        id: cache-save
         uses: actions/cache/save@v4
         with:
           path: |
             _freeze/
-          key: ${{ runner.os }}-primes-${{ github.run_id }}
+          key: ${{ runner.os }}-${{ hashFiles('**/Manifest.toml') }}
 
       - name: Deploy to GitHub Pages
         uses: JamesIves/github-pages-deploy-action@v4