Fix build script

Author: t-sommer

.github/workflows/build.yml

@@ -88,7 +88,11 @@ jobs:
     - uses: astral-sh/ruff-action@v3
     - run: ruff check
     - run: ruff format --check --diff
-    - run: echo "from modelica_fmi.gui import compile_resources; compile_resources()" | uv run -
+    - run: |
+        cd modelica_fmi
+        uv sync
+        echo "from modelica_fmi.gui import compile_resources; compile_resources()" | uv run -
+        cd ..
     - run: uv build modelica_fmi
     - uses: actions/upload-artifact@v4
       with: