add i18n sorting dependencies to docker

fixes CNVS-35005

Test Plan

1. run:  docker-compose build
2. run: docker-compose run --rm web bundle exec rake db:migrate:redo VERSION=20120502190901
3. Visit: /accounts/1/users
4. Create users with the names: Jalapeno, Jalapeoo, Jalapeño, JalapeЖo
5. Refresh the page and verify they are sorted:
   Jalapeno, Jalapeño, Jalapeoo, JalapeЖo
6. Create an assignment
7. Give each of the students created above a grade
8. Visit: /courses/1/gradebook/history
9. Click on the assignment name to display the hidden table.
10. Verify the table of students / grades is sorted:
    Jalapeno, Jalapeño, Jalapeoo, JalapeЖo

Change-Id: I9743c559a20a3d50600bcbc7e4a310105ec638cf
Reviewed-on: https://gerrit.instructure.com/102465
Tested-by: Jenkins
Reviewed-by: Neil Gupta <ngupta@instructure.com>
QA-Review: Anju Reddy <areddy@instructure.com>
Product-Review: Keith T. Garner <kgarner@instructure.com>

Dockerfile

@@ -16,6 +16,7 @@ RUN curl -sL https://deb.nodesource.com/setup_6.x | bash -\
        unzip \
        fontforge \
        python-lxml \
+       libicu-dev \
   && npm install -g gulp \
   && rm -rf /var/lib/apt/lists/*\
   && mkdir -p /home/docker/.gem/ruby/$RUBY_MAJOR.0

docker-compose.yml

@@ -13,7 +13,7 @@ services:
     command: bundle exec script/delayed_job run
 
   postgres:
-    image: postgres:9.3
+    build: ./docker-compose/postgres
 
   redis:
     image: redis:2.6

docker-compose/postgres/Dockerfile

@@ -0,0 +1,12 @@
+FROM postgres:9.3
+
+# Install dependencies for postgres extension for I18n sorting
+RUN apt-get update -qq \
+  && apt-get install -qqy \
+      build-essential \
+      libicu-dev \
+      postgresql-server-dev-all \
+      pgxnclient \
+  && rm -rf /var/lib/apt/lists/*
+# Install postgres extension for I8n sorting
+RUN pgxnclient install pg_collkey