Implement fully automated Jenkins HW8 setup with Ansible, JCasC and JJB

compose/images/slave-jjb/Dockerfile

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+FROM eclipse-temurin:21-jre
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        docker.io \
+        python3 \
+        python3-pip \
+    && pip3 install --break-system-packages --no-cache-dir "setuptools<81" "jenkins-job-builder>=6.4.3" \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL -o /usr/local/bin/swarm-client.jar \
+    https://repo.jenkins-ci.org/releases/org/jenkins-ci/plugins/swarm-client/3.51/swarm-client-3.51.jar
+
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

compose/images/slave-jjb/entrypoint.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+: "${JENKINS_URL:?JENKINS_URL is required}"
+: "${JENKINS_USER:?JENKINS_USER is required}"
+: "${JENKINS_PASSWORD:?JENKINS_PASSWORD is required}"
+: "${JENKINS_AGENT_NAME:?JENKINS_AGENT_NAME is required}"
+
+exec java -jar /usr/local/bin/swarm-client.jar \
+  -master "${JENKINS_URL}" \
+  -username "${JENKINS_USER}" \
+  -password "${JENKINS_PASSWORD}" \
+  -name "${JENKINS_AGENT_NAME}" \
+  -labels "${JENKINS_LABELS:-jjb docker}" \
+  -executors 1 \
+  -mode exclusive \
+  -disableSslVerification