Add bcr metadata

Author: pcj

.bcr/config.yml

@@ -0,0 +1,2 @@
+moduleRoots:
+  - "."

.bcr/metadata.template.json

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+{
+    "homepage": "https://github.com/stackb/rules_proto",
+    "maintainers": [
+        {
+            "name": "Paul Cody",
+            "email": "pcj@stack.build",
+            "github": "pcj"
+        }
+    ],
+    "repository": [
+        "github:stackb/rules_proto"
+    ],
+    "versions": [],
+    "yanked_versions": {}
+}

.bcr/presubmit.yml

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+bcr_test_module:
+  module_path: "."
+  matrix:
+    platform:
+      [
+        "debian10",
+        "ubuntu2004",
+        "macos",
+        "macos_arm64",
+        "windows",
+        "windows_arm64",
+      ]
+    bazel: [7.x, 8.x]
+  tasks:
+    run_tests:
+      name: "Run test module"
+      platform: ${{ platform }}
+      bazel: ${{ bazel }}
+      build_targets:
+        - "//..."
+      test_targets:
+        - "//..."

.bcr/source.template.json

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+{
+    "integrity": "",
+    "url": "https://github.com/{OWNER}/{REPO}/releases/download/{TAG}/rules_proto-{TAG}.tar.gz"
+}