Merge pull request #3694 from oatmealraisin/rymurphy/docker-build-args

Added documentation for adding Docker build args.

Author: ahardin-rh

dev_guide/builds/build_strategies.adoc

@@ -323,6 +323,25 @@ console], set the *Source Secret*.
 
 . Click the *Save* button.
 
+
+[[docker-strategy-build-args]]
+=== Docker Build Arguments
+
+To set link:http://docs.docker.com/v1.7/reference/api/hub_registry_spec/#docker-registry-1-0[Docker build arguments], add entries to the `BuildArgs` array, which is located in the `dockerStrategy` definition of the `BuildConfig`. For example:
+
+====
+[source,yaml]
+----
+dockerStrategy:
+...
+  buildArgs:
+    - name: "foo"
+      value: "bar"
+----
+====
+
+The build arguments will be passed to Docker when a build is started.
+
 ==== Enabling Pulling and Pushing
 
 Enable pulling to a private registry by setting the `Pull Secret` in the build