chore: Update Dockerfile permissions and Python path (#84)

# Pull Request

## Description

This change modifies the Dockerfile to enhance the execution environment
for the analyser module:

1. Adds a `chmod +x analyser` command to ensure the analyser is
executable.
2. Sets the `PYTHONPATH` environment variable to the root directory
(`/`).

These modifications improve the reliability and flexibility of the
container setup, ensuring proper permissions and module accessibility.

fixes #86

Dockerfile

@@ -14,4 +14,7 @@ RUN pip install --no-cache-dir poetry==1.8.3 \
 
 COPY analyser ./analyser
 
+RUN chmod +x analyser
+ENV PYTHONPATH=/
+
 ENTRYPOINT [ "poetry", "run", "python", "-m", "analyser" ]