Fix #776

integration/dockerfiles/Dockerfile_test_dockerignore_relative

@@ -0,0 +1,5 @@
+# This dockerfile makes sure Dockerfile.dockerignore is working
+# If so then ignore_relative/foo should copy to /foo
+# If not, then this image won't build because it will attempt to copy three files to /foo, which is a file not a directory
+FROM scratch 
+COPY ignore_relative/* /foo

integration/dockerfiles/Dockerfile_test_dockerignore_relative.dockerignore

@@ -0,0 +1,3 @@
+# A .dockerignore file to make sure dockerignore support works
+ignore_relative/**
+!ignore_relative/foo