Stop saving GitHub cache on pull requests

We should only save on pushes to main and other branches, and restore only in
pull requests. Currently, pull request runs pollute the cache.

Author: pquentin

.github/workflows/validate-apis.yml

@@ -41,14 +41,14 @@ jobs:
         with:
           node-version: 22
 
-      - name: Cache JSON report
-        id: cache-json-report
-        uses: actions/cache@v4
+      - name: Restore JSON report
+        if: github.event_name == 'pull_request'
+        uses: actions/cache/restore@v4
         with:
           path: ./clients-flight-recorder/recordings/types-validation/types-validation.json
-          key: types-validation-json-${{ github.event_name == 'pull_request' && format('{0}-{1}', github.base_ref, github.event.pull_request.base.sha) || format('{0}-{1}', github.ref_name, github.sha) }}
+          key: types-validation-json-${{ format('{0}-{1}', github.base_ref, github.event.pull_request.base.sha) }}
           restore-keys: |
-            types-validation-json-${{ github.event_name == 'pull_request' && github.base_ref || github.ref_name }}-
+            types-validation-json-${{ github.base_ref }}-
 
       - name: Install deps 1/2
         working-directory: ./clients-flight-recorder
@@ -87,6 +87,15 @@ jobs:
           BRANCH: ${{ github.ref_name }}
         run: node index.js --generate-report --ci --branch $BRANCH
 
+      - name: Save JSON report
+        if: github.event_name == 'push'
+        uses: actions/cache/save@v4
+        with:
+          path: ./clients-flight-recorder/recordings/types-validation/types-validation.json
+          key: types-validation-json-${{ format('{0}-{1}', github.ref_name, github.sha) }}
+          restore-keys: |
+            types-validation-json-${{ github.ref_name }}-
+
       - name: Run validation (PR)
         if: github.event_name == 'pull_request'
         id: validation