echo ouput dir instead of calling open

some ppl don't have `open`

justfile

@@ -86,7 +86,7 @@ dev-deploy url="http://localhost:8545" mnemonics="test test test test test test
 # This is meant for local development and produces HTML output. In CI
 # the lcov output is pushed to coveralls.
 code-coverage:
-  echo "Running code coverage"
+  @echo "Running code coverage"
   nix develop .#coverage -c cargo test --all-features --no-fail-fast --release --workspace -- --skip service::test::test_
   grcov . -s . --binary-path $CARGO_TARGET_DIR/debug/ -t html --branch --ignore-not-existing -o $CARGO_TARGET_DIR/coverage/
-  open $CARGO_TARGET_DIR/coverage/index.html
+  @echo "HTML report available at: $CARGO_TARGET_DIR/coverage/index.html"