docker: add gpio and spi groups

dockerfile

@@ -5,6 +5,8 @@ ARG USER=repeater
 ARG GROUP=repeater
 ARG PUID=15888
 ARG PGID=15888
+ARG GPIO_GID=986
+ARG SPI_GID=989
 ARG TARGETARCH
 ARG YQ_VERSION=v4.40.5
 
@@ -16,7 +18,9 @@ ENV INSTALL_DIR=/opt/pymc_repeater \
     PYTHONUNBUFFERED=1 \
     SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYMC_REPEATER=${PACKAGE_VERSION} \
     PUID=${PUID} \
-    PGID=${PGID}
+    PGID=${PGID} \
+    GPIO_GID=${GPIO_GID} \
+    SPI_GID=${SPI_GID}
 
 # Install runtime dependencies only
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
@@ -45,7 +49,10 @@ RUN arch="${TARGETARCH:-}" \
 
 # Create the group and user in order to run without root privileges
 RUN groupadd --gid "$PGID" "$GROUP" \
-    && useradd --uid "$PUID" --gid "$PGID" --home-dir "$HOME_DIR" --create-home --shell /usr/bin/bash "$USER"
+    && groupadd --gid "$GPIO_GID" gpio \
+    && groupadd --gid "$SPI_GID" spi \
+    && useradd --uid "$PUID" --gid "$PGID" --home-dir "$HOME_DIR" --create-home --shell /usr/bin/bash "$USER" \
+    && usermod -a -G gpio,spi "$USER"
 
 # Create runtime directories
 RUN mkdir -p ${INSTALL_DIR} ${CONFIG_DIR} ${DATA_DIR} \