CI: Optimisations

.github/actions/cache-node/action.yml

@@ -26,10 +26,20 @@ runs:
         key: node_modules-${{ runner.os }}-${{ hashFiles('ui/yarn.lock') }}
         path: ui/node_modules
 
+    - name: Cache nextjs build cache
+      uses: actions/cache@v4
+      with:
+        path: ${{ github.workspace }}/.next/cache
+        # Generate a new cache whenever packages or source files change.
+        key: ${{ runner.os }}-nextjs-${{ hashFiles('ui/src/yarn.lock') }}-${{ hashFiles('ui/src/*.js', 'ui/src/*.jsx', 'ui/src/*.ts', 'ui/src/*.tsx') }}
+        # If source files changed but packages didn't, rebuild from a prior cache.
+        restore-keys: |
+          ${{ runner.os }}-nextjs-${{ hashFiles('ui/src/yarn.lock') }}-
+
     - name: Install dependencies
       shell: bash
       run: |
         echo "Before installing dependencies" $(date "+%F %T.%3N")
         yarn --frozen-lockfile --network-concurrency 2
         (cd ui && yarn --frozen-lockfile --network-concurrency 2)
-        echo "After installing dependencies" $(date "+%F %T.%3N")
+        echo "After installing dependencies" $(date "+%F %T.%3N")