final few edits before testing

app/Dockerfile

@@ -9,10 +9,10 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
     PIP_NO_CACHE_DIR=1
 
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends gcc
+    apt-get install -y --no-install-recommends gcc && \
+    pip install --upgrade pip && \
+    pip install flake8==6.0.0
 
-RUN pip install --upgrade pip
-RUN pip install flake8==6.0.0
 COPY . /usr/src/app/
 RUN flake8 --ignore=E501,F401 .
 
@@ -35,8 +35,8 @@ RUN mkdir -p $HOME && \
 
 WORKDIR $APP_HOME
 
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends netcat
+RUN apk update && \
+    apk add --no-cache netcat-openbsd
 COPY --from=builder /usr/src/app/wheels /wheels
 COPY --from=builder /usr/src/app/requirements.txt .
 RUN pip install --upgrade pip && \

app/entrypoint.sh

@@ -1,15 +1,12 @@
 #!/bin/sh
 
-if [ "$DATABASE" = "postgres" ]
-then
-    echo "Waiting for postgres..."
+echo "Waiting for postgres..."
 
-    while ! nc -z $SQL_HOST $SQL_PORT; do
-      sleep 0.1
-    done
+while ! nc -z $SQL_HOST $SQL_PORT; do
+  sleep 0.1
+done
 
-    echo "PostgreSQL started"
-fi
+echo "PostgreSQL started"
 
 python manage.py flush --no-input
 python manage.py migrate