fix: update Rust installation check to use executable path for cargo

.gitea/workflows/build.yaml

@@ -44,7 +44,7 @@ jobs:
         shell: bash
         run: |
           set -e
-          if ! command -v cargo >/dev/null 2>&1; then
+          if [ ! -x "$HOME/.cargo/bin/cargo" ]; then
             curl -fsSL https://sh.rustup.rs | sh -s -- -y --default-toolchain stable
           fi
           echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"