CI: Optimisations

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

@@ -3,6 +3,9 @@ description: install and Cache Node Modules
 runs:
   using: composite
   steps:
+    - name: Timestamp 1
+      run: echo "Before installing Node" $(date "+%F %T.%3N")
+
     - name: Set up Node
       uses: actions/setup-node@v4
       with:
@@ -12,20 +15,42 @@ runs:
           yarn.lock
           ui/yarn.lock
 
+    - name: Timestamp 2
+      run: echo "Before restoring top-level node modules" $(date "+%F %T.%3N")
+
     - name: Cache top-level node modules
       id: top-node-modules
       uses: actions/cache@v4
       with:
         key: node_modules-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
         path: node_modules
 
+    - name: Timestamp 3
+      run: echo "Before restoring ui node modules" $(date "+%F %T.%3N")
+
     - name: Cache ui node modules
       id: ui-node-modules
       uses: actions/cache@v4
       with:
         key: node_modules-${{ runner.os }}-${{ hashFiles('ui/yarn.lock') }}
         path: ui/node_modules
 
+    - name: Timestamp 4
+      run: echo "Before restoring next build cache" $(date "+%F %T.%3N")
+
+    - 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('**/yarn.lock') }}-${{ hashFiles('**/*.js', '**/*.jsx', '**/*.ts', '**/*.tsx') }}
+        # If source files changed but packages didn't, rebuild from a prior cache.
+        restore-keys: |
+          ${{ runner.os }}-nextjs-${{ hashFiles('**/package-lock.json') }}-
+
+    - name: Timestamp 5
+      run: echo "Before running yarn install" $(date "+%F %T.%3N")
+
     - name: Install dependencies
       shell: bash
       run: |