There's no need in complicated logic since we can not (easily) change entry point after all

ci/docker/compose-web/Dockerfile-Basic

@@ -47,5 +47,3 @@ WORKDIR  androidx-main
 
 COPY bootstrap.sh bootstrap.sh
 RUN chmod a+x bootstrap.sh
-
-ENTRYPOINT ./bootstrap.sh

ci/docker/compose-web/bootstrap.sh

@@ -4,20 +4,14 @@ function bootstrap() {
     cd /androidx-main
     ~/bin/repo init -u https://android.googlesource.com/platform/manifest \
         -b androidx-main --depth=1 --partial-clone --clone-filter=blob:limit=10M
-    ~/bin/repo sync -c --no-tags --no-clone-bundle -j4
+    ~/bin/repo sync -c --no-tags --no-clone-bundle -j$(nproc --all)
 
     mkdir -p /mnt/agent
     ln -sf /androidx-main/tools/ /mnt/agent/tools
     ln -sf /androidx-main/prebuilts/ /mnt/agent/prebuilts
     ln -sf /androidx-main/external /mnt/agent/external
-}
 
-if [ ! -e /tmp/init ]; then
-    touch /tmp/init
-    echo "bootstrapping"
-    bootstrap
-else
-    echo "not bootstrapping, all done"
-fi
+    rm -rf /androidx-main/frameworks
+}
 
-/bin/bash
+bootstrap