# Do image, ek hi file se. Farak sirf DOOSRE stage ka hai - yaani cache.
#   --target tools  ->  course-p13-builder:nocache   (thanda ~/.m2)
#   (poora)         ->  course-p13-builder:1         (garam ~/.m2)

FROM maven:3.9-eclipse-temurin-21 AS tools
# Job ko docker ka CLIENT chahiye. Daemon runner ka apna hai aur uska socket
# job ke container me pehle se laga hota hai - yahan sirf binary aa rahi hai.
RUN curl -fsSL https://download.docker.com/linux/static/stable/aarch64/docker-29.8.1.tgz \
      | tar xz -C /tmp docker/docker \
 && mv /tmp/docker/docker /usr/local/bin/docker \
 && rm -rf /tmp/docker

FROM tools AS warm
# Ek baar poora build chala do - maqsad ~/.m2 bharna hai, jar banana nahi.
# `;` isliye hai `&&` nahi: seed build fail bhi ho to jitni jar utri wo reh jaayein.
COPY . /seed
RUN cd /seed && mvn -B -q clean verify ; rm -rf /seed