Use absolute cargo path in toolchain step too

.gitea/workflows/sandbox.yml

@@ -37,8 +37,9 @@ jobs:
           if ! command -v cargo >/dev/null && [ ! -x "$HOME/.cargo/bin/cargo" ]; then
             curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain stable
           fi
+          # runner v5.2.2 does not apply GITHUB_PATH to later steps, so use absolute paths
           echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
-          cargo --version
+          "$HOME/.cargo/bin/cargo" --version
 
       - name: Test
         run: |