Add trailing slash to COPY command
Add trailing slash to COPY command

Workaround for https://devhub.joyent.com/jira/browse/DOCKER-918, which
prevents `docker build` on Triton from copying files to a directory when
no trailing slash is used.
slawa999/test,Grizzlyt/hello-world,autopilotpattern/hello-world,Grizzlyt/hello-world,slawa999/test,Grizzlyt/hello-world,autopilotpattern/hello-world,slawa999/test,autopilotpattern/hello-world