Merge namecoin/ncdns#178: Cirrus: Add README/license/docs to Nightly artifacts

d2e0c4ce38 Cirrus: Add README/license/docs to Nightly artifacts (Jeremy Rand)

Pull request description:

Top commit has no ACKs.

Tree-SHA512: 63bb28162778e7bccf0d789cad1ca78631817b93f9c32fcd54224130d1e441e8584dbd340f6edc3fbc4b32f5c93f0a8ed028df6b54592f29411d1f3197ba5852

testdata/dist.bash

@@ -8,6 +8,10 @@ mkdir dist
 pushd idist || exit 1
 for x in *; do
   echo "$x"
+  mkdir -p "$x/doc"
+  cp -a "../README.md" "$x/"
+  cp -a "../COPYING" "$x/"
+  cp -a "../_doc/"* "$x/doc/"
   tar -caf "../dist/$(basename "$x").tar.gz" "$x"
 done
 popd || exit 1