only create group if not exists

dev.Dockerfile

@@ -8,14 +8,14 @@ ARG GROUP_NAME
 WORKDIR /app
 
 RUN apt-get update \
- && apt-get install -y -q git-core curl vim-tiny \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
+  && apt-get install -y -q git-core curl vim-tiny \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
 
-RUN addgroup --gid $GROUP_ID $GROUP_NAME \
- && adduser --uid $USER_ID --gid $GROUP_ID $USER_NAME
+RUN if ! getent group "$GROUP_ID"; then addgroup --gid $GROUP_ID $GROUP_NAME; fi
+RUN adduser --uid $USER_ID --gid $GROUP_ID $USER_NAME
 
 RUN git config --global --add safe.directory /app
 
 RUN pip install --upgrade pip
-RUN pip install poetry==1.8.1
+RUN pip install poetry==1.8.1

spiffworkflow-backend/dev.Dockerfile

@@ -3,11 +3,11 @@ FROM python:3.12.1-slim-bookworm
 WORKDIR /app
 
 RUN apt-get update \
- && apt-get install -y -q \
-    gcc libssl-dev libpq-dev default-libmysqlclient-dev \
-    pkg-config libffi-dev git-core curl sqlite3 \
- && apt-get clean \
- && rm -rf /var/lib/apt/lists/*
+  && apt-get install -y -q \
+  gcc libssl-dev libpq-dev default-libmysqlclient-dev \
+  pkg-config libffi-dev git-core curl sqlite3 \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
 
 RUN pip install --upgrade pip
 RUN pip install poetry==1.8.1 pytest-xdist==3.5.0