Setup testing branch

docker-configs/Dockerfile-proxy

@@ -25,6 +25,7 @@ RUN adduser -D -u 54000 radio && \
         cd /opt && \
         git clone https://gitlab.hacknix.net/hacknix/FreeDMR.git freedmr && \
         cd /opt/freedmr && \
+	git checkout testing && \
         pip install --no-cache-dir -r requirements.txt && \
         apk del git gcc musl-dev && \
         chown -R radio: /opt/freedmr