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FROM jenkins/jenkins:lts
USER root
# Install Docker CLI so Jenkins can spawn sibling containers via host's docker.sock
RUN apt-get update && apt-get install -y \
ca-certificates \
curl \
gnupg \
&& install -m 0755 -d /etc/apt/keyrings \
&& curl -fsSL 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 $(. /etc/os-release && echo "$VERSION_CODENAME") stable" > /etc/apt/sources.list.d/docker.list \
&& apt-get update \
&& apt-get install -y docker-ce-cli \
&& rm -rf /var/lib/apt/lists/*
# Add jenkins user to docker group so it can use docker.sock
RUN groupadd -f docker && usermod -aG docker jenkins
USER jenkins
# Pre-install Docker Pipeline plugin (enables agent { docker { image '...' } } in Jenkinsfiles)
RUN jenkins-plugin-cli --plugins "docker-workflow"
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