install psycopg2

Dockerfile

@@ -12,11 +12,15 @@ EXPOSE 8000
 ARG DEV=false
 RUN python -m venv /py && \
     /py/bin/pip install --upgrade pip && \
+    apk add --update --no-cache postgresql-client && \
+    apk add --update --no-cache --virtual .tmp-build-deps \
+        build-base postgresql-dev musl-dev && \
     /py/bin/pip install -r /tmp/requirements.txt && \
     if [ $DEV = "true" ]; \
         then /py/bin/pip install -r /tmp/requirements.dev.txt; \
     fi && \
     rm -rf /tmp && \
+    apk del .tmp-build-deps && \
     adduser \
         --disabled-password \
         --no-create-home \

requirements.txt

@@ -1,2 +1,3 @@
 Django>=3.2.4,<3.3
-djangorestframework>=3.12.4,<3.13
+djangorestframework>=3.12.4,<3.13
+psycopg2>=2.8.6,<2.9