Update Dockerfile for GraphQL lab to pin dependency versions

- Adjusted the Dockerfile to pin specific versions of dependencies to ensure compatibility with flask-graphql and graphene 2.x.
- Included constraints for werkzeug and markupsafe to prevent installation issues related to version incompatibilities.

Author: santosomar

additional-labs/GraphQL/Dockerfile

@@ -4,12 +4,14 @@ FROM python:3.9-slim
 WORKDIR /app
 
 # Install the dependencies
-RUN pip install flask graphene flask-graphql werkzeug
+# Pin versions to ensure compatibility with flask-graphql and graphene 2.x
+# flask-graphql is not compatible with graphene 3.x or werkzeug 2.2+
+# markupsafe<2.1.0 is needed because soft_unicode was removed in 2.1.0
+RUN pip install "graphene<3" "flask-graphql" "flask<2.2" "werkzeug<2.2" "markupsafe<2.1.0"
 
 # Copy the app.py file
 COPY app.py .
 
 EXPOSE 5023
 
 CMD ["python", "app.py"]
-