Fix window environment variable setting in CI

Author: fornwall

.github/workflows/ci.yml

@@ -20,7 +20,9 @@ jobs:
       with:
         toolchain: ${{ matrix.rust }}
     - name: Run unit tests
-      run: rustc --version && cargo --version && CLICOLOR=0 cargo test --features online_tests
+      run: rustc --version && cargo --version && cargo test --features online_tests
+      env:
+        CLICOLOR: 0
     - name: Run script tests
       if: runner.os != 'Windows'
       run: |