Fix docker build issues.

Dockerfile

@@ -3,8 +3,10 @@ LABEL maintainer="Kevin Lyda <lyda@gitlab.com>"
 
 EXPOSE 80 22
 
-RUN DEBIAN_FRONTEND=noninteractive \
-    apt-get install curl openssh-server ca-certificates postfix
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive \
+    apt-get install -y curl openssh-server ca-certificates postfix \
+    && apt-get clean
 ADD app /app
 
 ENTRYPOINT ["/app/init"]

app/init

@@ -11,7 +11,8 @@ EOF
   exit 1
 fi
 
+apt-get update
 curl -s $base_url$EDITION/script.deb.sh | bash
-apt-get install gitlab-${EDITION}=${VERSION}-${EDITION}.0
+apt-get install -y gitlab-${EDITION}=${VERSION}-${EDITION}.0
 gitlab-ctl reconfigure
 exec bash