Add .gcloudignore and cloudbuild.yaml to open source build

Forgot to do this when I exported... Will have to do another export after this CL is added.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=222296851

.gcloudignore

@@ -0,0 +1,7 @@
+docs/**
+python/**
+bazel-*/**
+gradle/**/build/**
+gradle/**/WEB-INF/**
+gradle/.*/**
+gradle/gradle/**