feat: update app Dockerfile

Dockerfile

@@ -1,16 +1,22 @@
 FROM python:3.8-alpine
 
+# install base system
 RUN apk add --no-cache gcc libc-dev linux-headers
-
-# install pypi packages
-COPY . /django_project
 RUN pip install --upgrade pip
-RUN pip install /django_project
 RUN pip install uWSGI==2.0.21
 
 COPY ./docker/uwsgi.ini /uwsgi.ini
-COPY ./scripts /scripts
-RUN chmod -R +x /scripts
+
+# install requirements
+WORKDIR /django_project
+COPY ./requirements.txt .
+RUN pip install -r requirements.txt
+
+# then scripts (likely wont change often)
 ENV PATH="/scripts:/py/bin:$PATH"
+COPY --chmod=700 ./scripts /scripts
+
+# finally copy app (likely will invalidate cache)
+COPY . .
 
 CMD ["on-deploy.sh"]