feat(docker): use alpine for the base image

Use alpine for our base image since this reduces the container size by
about half. Plus, most of this is just Python, bash, and make scripting
anyway. Nothing Ubuntu specific anymore.

Signed-off-by: Randolph Sapp <[email protected]>

docker/Dockerfile

@@ -1,34 +1,23 @@
 # SPDX-License-Identifier: MIT
 # Copyright (C) 2024 Texas Instruments Incorporated - https://www.ti.com
 
-FROM debian:stable-slim
+FROM alpine:3
 
-RUN apt-get update \
-	&& DEBIAN_FRONTEND=noninteractive apt-get install -y \
-		--no-install-recommends \
+RUN apk add --no-cache \
+		bash \
 		dumb-init \
 		git \
-		gosu \
 		make \
-		python3-pip \
+		py3-pip \
 		ripgrep \
+		shadow \
+		su-exec \
 		zip \
 	&& echo "**** create abc user and make our folders ****" \
 	&& useradd -u 1000 -U -d /config -s /bin/false abc \
 	&& usermod -G users abc \
 	&& mkdir /build && chown abc:abc /build \
-	&& mkdir /config && chown abc:abc /config \
-	&& echo "**** cleanup ****" \
-	&& apt-get autoremove \
-	&& apt-get clean \
-	&& rm -rf \
-		/tmp/* \
-		/var/cache/debconf/*-old \
-		/var/lib/apt/lists/* \
-		/var/lib/dpkg/status-old \
-		/var/lib/sgml-base/supercatalog.old \
-		/var/log/apt/term.log \
-		/var/tmp/*
+	&& mkdir /config && chown abc:abc /config
 
 RUN --mount=type=bind,source=requirements.txt,target=/tmp/requirements.txt \
 	python3 -m pip install -r /tmp/requirements.txt --no-cache-dir \

docker/root/init

@@ -42,5 +42,5 @@ fi
 if [ "$(id -u)" == "$(id -u abc)" ]; then
 	exec dumb-init -- "$@"
 else
-	exec dumb-init -- gosu abc "$@"
+	exec dumb-init -- su-exec abc:abc "$@"
 fi