Implement builder image

Add docker build to create a shared image for running CI pipelines and
docker builds based on debian.

Dockerfile

@@ -0,0 +1,27 @@
+FROM debian:bookworm
+
+RUN set -eux; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		ca-certificates \
+		curl \
+		git \
+	; \
+	install -m 0755 -d /etc/apt/keyrings; \
+	curl -sSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc; \
+	chmod a+r /etc/apt/keyrings/docker.asc; \
+	echo \
+		"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] \
+		https://download.docker.com/linux/debian \
+		bookworm stable" \
+	> /etc/apt/sources.list.d/docker.list; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends \
+		docker-ce-cli \
+		docker-buildx-plugin \
+		docker-compose-plugin \
+	; \
+	rm -rf /var/lib/apt/lists/*
+
+# References:
+# - docker: https://docs.docker.com/engine/install/debian/#install-from-a-package