Add tool to upload package from prebuilts.

tools/upload_package_from_prebuilts.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# Install Maven, i.e.
+#  brew install mvn
+#
+# Create $HOME/.m2/settings.xml like this
+#<settings>
+#<repositories>
+#    <repository>
+#        <id>SpaceDev</id>
+#        <url>https://maven.pkg.jetbrains.space/public/p/compose/dev</url>
+#        <snapshots>
+#            <enabled>false</enabled>
+#        </snapshots>
+#    </repository>
+#</repositories>
+#<servers>
+#   <server>
+#         <id>SpaceDev</id>
+#         <username>XXX</username>
+#         <password>XXX</password>
+#   </server>
+#</servers>
+#</settings>
+#
+# Correct ANDROIDX_MAIN environment variable to point to androidx-main checkout.
+export ANDROIDX_MAIN=$HOME/compose/androidx-main
+
+# Set those variables to the package and version you'd like to upload.
+export GROUP=org/jetbrains/dokka
+export PACKAGE_ID=dokka-fatjar
+export VERSION=0.9.17-g013
+
+# No user-serviceable parts below, just run the script.
+export PREBUILTS=${ANDROIDX_MAIN}/prebuilts/androidx/external
+export DIR=${PREBUILTS}/${GROUP}/${PACKAGE_ID}/${VERSION}
+export PACKAGE=${PACKAGE_ID}-${VERSION}
+export POM=${DIR}/${PACKAGE}.pom
+export JAR=${DIR}/${PACKAGE}.jar
+export SOURCES=${DIR}/${PACKAGE}-sources.jar
+export REPO=https://maven.pkg.jetbrains.space/public/p/compose/dev
+
+mvn deploy:deploy-file \
+  -Dfile=${JAR} \
+  -DpomFile=${POM} \
+  -Durl=${REPO} \
+  -DrepositoryId=SpaceDev