fix typo

Author: JustinIven

Dockerfile

@@ -5,4 +5,6 @@ COPY ./requirements.txt ./requirements.txt
 
 RUN pip install --no-cache-dir --upgrade -r ./requirements.txt
 
-CMD ["fastapi", "run", /"app/main.py", "--port", "80"]
+EXPOSE 80
+
+CMD ["fastapi", "run", "/app/main.py", "--port", "80"]