HDDS-13620. Define pnpm-version in check.yml

Author: devabhishekpal

.github/workflows/check.yml

@@ -45,6 +45,12 @@ on:
         default: ''
         required: false
 
+      pnpm-version:
+        type: string
+        description: "pnpm version to use for builds (default: none)"
+        default: ''
+        required: false
+
       needs-maven-cache:
         type: boolean
         description: "Whether to restore Maven cache before run (default: yes)"