add step to enable yarn to work arounfd a bug with actions/setup-node

action.yaml

@@ -35,6 +35,12 @@ runs:
           exit 1
         fi
 
+    # Handles known issue with setting packageManager in package.json and
+    # enabling caching here.
+    - name: Install Yarn via corepack
+      shell: bash
+      run: corepack enable
+
     - name: Setup NodeJS
       id: install-node
       uses: actions/setup-node@v4
@@ -44,7 +50,6 @@ runs:
         cache: yarn
         cache-dependency-path: ${{ inputs.working_directory }}/yarn.lock
 
-
     - name: Check yarn.lock
       id: check-yarn-lock
       shell: bash