fixes

action.yml

@@ -80,8 +80,8 @@ runs:
         if [[ ! -v RUST_BACKTRACE ]]; then
           echo "RUST_BACKTRACE=short" >> $GITHUB_ENV
         fi
-        if [[ -v "$NEW_RUSTFLAGS" ]]; then
-          echo "RUSTFLAGS="$NEW_RUSTFLAGS" >> $GITHUB_ENV
+        if [[ -v NEW_RUSTFLAGS ]]; then
+          echo "RUSTFLAGS=$NEW_RUSTFLAGS" >> $GITHUB_ENV
         fi
         # Enable faster sparse index on nightly
         # The value is ignored on stable and causes no problems