chore: install polywrap CLI when building wrap-test-harness

Author: dOrgJelli

.github/workflows/ci-wrap-test-harness.yaml

@@ -76,6 +76,10 @@ jobs:
         run: (yarn install --nonInteractive --frozen-lockfile --prefer-offline || yarn install --nonInteractive --frozen-lockfile --prefer-offline)
         working-directory: ./toolchain
 
+      - name: Install polywrap CLI
+        run: yarn install polywrap@0.11.0-pre.4
+        working-directory: ./toolchain
+
       - name: Build toolchain
         run: yarn build
         working-directory: ./toolchain