Why do we install both the JRE and the JDK?

[yeikel]

I noticed that we are currently installing both the JDK and the JRE to the image:

common-docker/base/Dockerfile.ubi8

Line 103 in c782a4f

"zulu17-ca-jdk-headless${ZULU_OPENJDK_VERSION}" "zulu17-ca-jre-headless${ZULU_OPENJDK_VERSION}" \

Is there any particular reason why we need both?

Typically the JDK includes everything the JRE does plus additional build tools. It is unclear to me why we need to add both to the image