local dynamodb config

refs FOO-781

TEST PLAN:
 1) run global lookups init script from console
 2) nothing happens, it's a stub.
 3) checkout MRA with global lookups
 4) init script works, new table for lookups in DDB

Change-Id: I09e705e6448fd791b2c17a44f7bcae94060ed46c
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/244182
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Michael Ziwisky <mziwisky@instructure.com>
QA-Review: Michael Ziwisky <mziwisky@instructure.com>
Product-Review: Michael Ziwisky <mziwisky@instructure.com>

docker-compose/dynamodb.override.yml

@@ -0,0 +1,20 @@
+# to use this for global lookups add docker-compose/dynamodb.override.yml
+# to your COMPOSE_FILE var in .env
+# Then:
+# - Run `GlobalLookups.initialize_ddb_for_development!` from a console
+version: '2.3'
+services:
+  web:
+    depends_on:
+      - "dynamodb"
+    links:
+      - dynamodb
+    environment:
+      AWS_ACCESS_KEY_ID: 'DUMMYIDEXAMPLE'
+      AWS_SECRET_ACCESS_KEY: 'DUMMYEXAMPLEKEY'
+
+  dynamodb:
+    image: instructure/dynamo-local-admin:latest
+    container_name: dynamodb-local
+    ports:
+      - "8000:8000"

lib/stubs/global_lookups.rb

@@ -21,4 +21,10 @@ module GlobalLookups
       false
     end
   end
+
+  unless singleton_class.method_defined?(:initialize_ddb_for_development!)
+    def self.initialize_ddb_for_development!
+      puts("Nothing to do for global lookups stub")
+    end
+  end
 end