Use hosted memcache alpha

Dockerfile

@@ -1,12 +1,5 @@
 FROM google/dart-runtime-base:1.25.0-dev.9.0
 
-# We install memcached and remove the apt-index again to keep the
-# docker image diff small.
-RUN apt-get update && \
-    apt-get upgrade -y && \
-    apt-get install -y git memcached unzip && \
-    rm -rf /var/lib/apt/lists/*
-
 # Let the pub server know that this is not a "typical" pub client but rather a bot.
 ENV PUB_ENVIRONMENT="bot.pub_dartlang_org.docker"
 
@@ -26,4 +19,4 @@ RUN pub get --offline
 # Clear out any arguments the base images might have set and ensure we start
 # memcached and wait for it to come up before running the Dart app.
 CMD []
-ENTRYPOINT service memcached start && sleep 1 && /bin/bash /dart_runtime/dart_run.sh
+ENTRYPOINT /bin/bash /dart_runtime/dart_run.sh

app/pubspec.lock

@@ -18,7 +18,7 @@ packages:
       name: appengine
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.1"
+    version: "0.4.2"
   archive:
     description:
       name: archive
@@ -240,7 +240,7 @@ packages:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.1+1"
+    version: "0.12.1+3"
   memcache:
     description:
       name: memcache
@@ -324,7 +324,7 @@ packages:
       name: pub_server
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.1+3"
+    version: "0.1.1+4"
   quiver:
     description:
       name: quiver
@@ -342,7 +342,7 @@ packages:
       name: shelf_packages_handler
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0"
+    version: "1.0.2"
   shelf_static:
     description:
       name: shelf_static

app/pubspec.yaml

@@ -4,7 +4,7 @@ author: Dart Team
 description: The pub.dartlang.org website.
 sdk: ">=1.19.0 <2.0.0"
 dependencies:
-  appengine: '^0.4.1'
+  appengine: '^0.4.2'
   args: '^0.13.7'
   gcloud: '>=0.4.0 <0.5.0'
   googleapis: '>=0.31.0 <0.37.0'