fix missing bin dir in github CI

Author: mikemaccana

.github/workflows/tests.yaml

@@ -18,6 +18,9 @@ jobs:
           # Install Solana CLI (beta, required to fix 'ahash' issue)
           solana-cli-version: "1.18.5"
 
+      - name: Add Solana bin to PATH
+        run: echo "$HOME/.local/share/solana/install/active_release/bin" >> $GITHUB_PATH
+
       - name: Setup Node.js version
         uses: actions/setup-node@v4
         with: