Add example Dockerfile

Dockerfile

@@ -0,0 +1,31 @@
+FROM jenkins/inbound-agent:alpine AS jnlp
+
+FROM python:3.13.2-alpine
+
+# USER jenkins
+RUN apk --no-cache -U add openjdk17-jre python3 postgresql-client git python3-dev openssh mysql-client build-base curl \
+  && apk cache clean
+RUN python3 -m ensurepip \
+  && pip3 install --no-cache-dir --upgrade pip setuptools
+
+# USER root
+# ADD ca-chain.der .
+
+# RUN $JAVA_HOME/bin/keytool -noprompt -alias local-CA \
+#   -keystore "$JAVA_HOME/jre/lib/security/cacerts" \
+#   -import -file ca-chain.der \
+#   -storepass changeit
+
+# USER jenkins
+COPY --from=jnlp /usr/local/bin/jenkins-agent /usr/local/bin/jenkins-agent
+COPY --from=jnlp /usr/share/jenkins/agent.jar /usr/share/jenkins/agent.jar
+
+RUN mkdir "$HOME/.ssh/" \
+  && touch "$HOME/.ssh/known_hosts" \
+  && ssh-keyscan github.com >> ~/.ssh/known_hosts
+
+# COPY ca-chain.crt "$JAVA_HOME/jre/lib/security"
+# RUN cd "$JAVA_HOME/jre/lib/security" \
+#   && keytool -import -alias homeca -storepass changeit -noprompt -trustcacerts -keystore cacerts -file ca-chain.crt
+
+ENTRYPOINT ["/usr/local/bin/jenkins-agent"]