workflow: update benchmarks notebook generation

Signed-off-by: Stephan Renatus <stephan.renatus@gmail.com>

.github/workflows/benchmarks.yaml

@@ -55,7 +55,7 @@ jobs:
           --input changed_files.json \
           --format pretty \
           'data.policy["pr-check"]' > opa_result.json
-          
+
           go_result=$(jq -r '.changes.go // false' opa_result.json)
 
           echo "go=${go_result}" >> $GITHUB_OUTPUT
@@ -88,21 +88,33 @@ jobs:
         with:
           ref: benchmarks
           persist-credentials: true
-      - name: Install Node
-        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      - name: Setup Java
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
-          node-version: 25
+          distribution: 'temurin'
+          java-version: '21'
+      - name: Setup Clojure
+        uses: DeLaGuardo/setup-clojure@02f5a82b79a547523e664fe8a7a32ea14884d7b2 # 13.6.0
+        with:
+          cli: latest
+      - name: Cache Clojure dependencies
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        with:
+          path: |
+            ~/.m2/repository
+            ~/.gitlibs
+          key: clj-${{ hashFiles('clay/deps.edn') }}
+          restore-keys: clj-
+      - name: Clean previous output
+        run: rm -rf docs/*.html
       - name: update notebook
         run: |
-          npm ci
-          cp ../benchmarks.json . # nodejs data loader can't access ../
-          npm run docs:build
-          rm benchmarks.json
-        working-directory: src/
+          clojure -M -m opa-bench.generate
+        working-directory: clay/
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: commit if changed
-        working-directory: benchmarks/ # output dir of the docs:build command
+        working-directory: docs/
         run: |
           if ! git diff-index --quiet HEAD -- .; then
             git config --local user.email "${GITHUB_ACTOR}@users.noreply.github.com"