feat: add docker cli to ubuntu image

README.md

@@ -8,4 +8,6 @@ https://git.martin-riedl.de/ci/-/packages/container/ubuntu/24.04
 
 - ca-certificates
 - curl
+- docker-ce-cli
+- docker-buildx-plugin
 - nodejs 22

images/ubuntu/24.04/Dockerfile

@@ -9,3 +9,16 @@ RUN apt-get update && apt-get install -y --no-install-recommends curl ca-certifi
     apt-get install -y --no-install-recommends nodejs && \
     rm -rf /var/lib/apt/lists/* && \
     node -v
+
+# install docker client
+# https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository
+RUN install -m 0755 -d /etc/apt/keyrings && \
+    curl -fsSL https://download.docker.com/linux/ubuntu/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/ubuntu \
+      $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
+      tee /etc/apt/sources.list.d/docker.list > /dev/null && \
+    apt-get update && apt-get install -y --no-install-recommends docker-ce-cli docker-buildx-plugin && \
+    rm -rf /var/lib/apt/lists/* && \
+    docker -v \