chore: use env for yarn

Author: Qbandev

action.yml

@@ -86,11 +86,9 @@ runs:
       env:
         COREPACK_ENABLE_UNSAFE_CUSTOM_URLS: 1
         YARN_CUSTOM_URL: ${{ inputs.yarn-custom-url }}
-      env:
-        COREPACK_ENABLE_UNSAFE_CUSTOM_URLS: 1
       run: |
-        echo "Preparing and activating custom Yarn from URL: ${{ inputs.yarn-custom-url }}"
-        corepack prepare "yarn@${{ inputs.yarn-custom-url }}" --activate
+        echo "Preparing and activating custom Yarn from URL: ${{ env.YARN_CUSTOM_URL }}"
+        corepack prepare "yarn@${{ env.YARN_CUSTOM_URL }}" --activate
       shell: bash
 
     # In a low-risk environment, try to download cache of `node_modules`, if it