Update app requirements and image build commands

- Adds 'tzdata' requirement
- Run `pipenv lock` as part of container build

I ran into the necessity to add this package and run `pipenv lock` to get everything to build and start properly for me. I don't think this change causes any bad effects but more eyes are welcome in case it is unnecessary.

Author: korlaxxalrok

Dockerfile

@@ -12,11 +12,11 @@ RUN apt-get install python3 -y
 RUN apt-get install python3-pip -y
 RUN python3 -m pip install --upgrade pip
 RUN pip3 install pipenv
+RUN pipenv lock
 RUN pipenv requirements > requirements.txt
 RUN pip3 install -r requirements.txt
 
 WORKDIR /home/python
-# RUN pipenv install --system --deploy
 COPY /src .
 COPY /gunicorn/gunicorn.py .
 ENV PATH="/home/python/.local/bin:${PATH}"

Pipfile

@@ -27,6 +27,7 @@ django-coverage-plugin = "*"
 django-extensions-models = "*"
 mypy = "*"
 django-stubs = "*"
+tzdata = "*"
 
 [dev-packages]
 flake8 = "*"