use alpine syntax

diff --git a/Dockerfile.base b/Dockerfile.base
index 306ba97a0b75c0b544cd6090a84d2d7f0646a028..b1ed903480f31b9d8bac8fe5577757a26ece8290 100644 (file)
--- a/Dockerfile.base
+++ b/Dockerfile.base
@@ -40,8 +40,8 @@ RUN python3 -m venv $VIRTUAL_ENV
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
 # create mass user (PID 1000, GID 1000)
-RUN groupadd -g 1000 massgroup && \
-    useradd -m -u 1000 -g massgroup mass
+RUN addgroup --gid 1000 massgroup && \
+    adduser --system --uid 1000 --ingroup massgroup mass
 
 USER mass