Add RUSTBACKTRACE as env

Author: mo8it

.github/workflows/rust.yml

@@ -37,7 +37,9 @@ jobs:
       - uses: actions/checkout@v6
       - uses: swatinem/rust-cache@v2
       - name: cargo test
-        run: RUST_BACKTRACE=1 cargo test --workspace
+        env:
+          RUST_BACKTRACE: 1
+        run: cargo test --workspace
   dev-check:
     runs-on: ubuntu-latest
     steps: