Add repository to metadata

.bcr/metadata.template.json

diff --git a/.bcr/metadata.template.json b/.bcr/metadata.template.json
index fc7026e..41ba4c2 100644
--- a/.bcr/metadata.template.json
+++ b/.bcr/metadata.template.json
@@ -2,5 +2,8 @@
   "homepage": "https://github.com/bazelbuild/rules_java",
   "maintainers": [],
   "versions": [],
-  "yanked_versions": {}
+  "yanked_versions": {},
+  "repository": [
+    "github:bazelbuild/rules_java"
+  ]
 }