Add new database.yml.decomposed-postgresql file

This file will contain database configuration for the mode where GitLab
operates with decomposed databases.databases

config/database.yml.decomposed-postgresql

+#
+# Development specific
+#
+development:
+  main:
+    adapter: postgresql
+    encoding: unicode
+    database: gitlabhq_development
+    username: postgres
+    password: "secure password"
+    host: localhost
+    variables:
+      statement_timeout: 15s
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test: &test
+  main:
+    adapter: postgresql
+    encoding: unicode
+    database: gitlabhq_test
+    username: postgres
+    password:
+    host: localhost
+    prepared_statements: false
+    variables:
+      statement_timeout: 15s

scripts/prepare_build.sh

@@ -10,7 +10,12 @@ fi
 cp config/gitlab.yml.example config/gitlab.yml
 sed -i 's/bin_path: \/usr\/bin\/git/bin_path: \/usr\/local\/bin\/git/' config/gitlab.yml
 
-cp config/database.yml.postgresql config/database.yml
+if [ "$DECOMPOSED_DB" == "true" ]; then
+  echo "Using decomposed database config (config/database.yml.decomposed-postgresql)"
+  cp config/database.yml.decomposed-postgresql config/database.yml
+else
+  cp config/database.yml.postgresql config/database.yml
+fi
 
 if [ -f config/database_geo.yml.postgresql ]; then
   cp config/database_geo.yml.postgresql config/database_geo.yml