update docker and workflow file

.github/workflows/python-app-unit-tests.yml

@@ -17,12 +17,12 @@ jobs:
 
       # Pull the latest version of the base image to ensure it's up to date
       - name: Pull latest base image
-        run: docker pull tiangolo/uvicorn-gunicorn-fastapi:python3.9
+        run: docker pull ubuntu:20.04
 
       # Build the Docker image, with caching of Docker layers
       - name: Build Docker image
         run: |
-          docker build -t fastapirepo . --cache-from tiangolo/uvicorn-gunicorn-fastapi:python3.9
+          docker build -t fastapirepo . --cache-from ubuntu:20.04
 
       # Run unit tests in the Docker container
       - name: Unit Tests

Dockerfile

@@ -39,4 +39,4 @@ RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
 # Copy your application source code and script
 COPY ./src /app
 
-CMD ["uvicorn", "app.app.main:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]