build backend in CI

use this build package in docker-compose;

(cherry picked from commit 1d1dd227fa)

backend/Dockerfile

@@ -2,20 +2,24 @@ FROM        python:3.8-slim
 ENV         PYTHONUNBUFFERED 1
 ENV         PATH="/opt/venv/bin:$PATH"
 
-RUN         apt-get update; \
-            apt-get install -y build-essential gcc; \
-            python -m venv /opt/venv; \
-            python -m pip install --upgrade pip; \
-            mkdir /code;
-
-WORKDIR     /code
-
-COPY        setup.py /code/
-COPY        requirements.txt /code/
-
-RUN         pip install -r requirements.txt
+# will be build in a different stage in CI
+#RUN         apt-get update; \
+#            apt-get install -y build-essential gcc; \
+#            python -m venv /opt/venv; \
+#            python -m pip install --upgrade pip; \
+#            mkdir /code;
+#
+#WORKDIR     /code
+#
+#COPY        setup.py /code/
+#COPY        requirements.txt /code/
+#
+#RUN         pip install -r requirements.txt
 
+# install and use built artifact
 COPY        . /code/
+WORKDIR     /code
+RUN         pip install ./dist/waecm*
 
-RUN			chmod 777 scripts/entrypoint.sh
-ENTRYPOINT  ["scripts/entrypoint.sh"]
+RUN			chmod 777 ./scripts/entrypoint.sh
+ENTRYPOINT  ["./scripts/entrypoint.sh"]