Fix cache

Author: joehoyle

.github/workflows/build.yml

@@ -70,6 +70,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          cache-key: ${{ matrix.target }}-${{ matrix.php-version }}-${{ matrix.platform }}-${{ matrix.distro }}
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2