[Multi-User Part 1]: Enable storage of settings for plaintext files based on user account (#498)

- Partition configuration for indexing local data based on user accounts
- Store indexed data in an underlying postgres db using the `pgvector` extension
- Add migrations for all relevant user data and embeddings generation. Very little performance optimization has been done for the lookup time
- Apply filters using SQL queries
- Start removing many server-level configuration settings
- Configure GitHub test actions to run during any PR. Update the test action to run in a containerized environment with a DB.
- Update the Docker image and docker-compose.yml to work with the new application design

Dockerfile

@@ -8,13 +8,20 @@ RUN apt update -y && apt -y install python3-pip git
 WORKDIR /app
 
 # Install Application
-COPY . .
+COPY pyproject.toml .
+COPY README.md .
 RUN sed -i 's/dynamic = \["version"\]/version = "0.0.0"/' pyproject.toml && \
     pip install --no-cache-dir .
 
+# Copy Source Code
+COPY . .
+
+# Set the PYTHONPATH environment variable in order for it to find the Django app.
+ENV PYTHONPATH=/app/src:$PYTHONPATH
+
 # Run the Application
 # There are more arguments required for the application to run,
 # but these should be passed in through the docker-compose.yml file.
 ARG PORT
 EXPOSE ${PORT}
-ENTRYPOINT ["khoj"]
+ENTRYPOINT ["python3", "src/khoj/main.py"]