Add .bcr folder

Author: cerisier

.bcr/metadata.template.json

@@ -0,0 +1,20 @@
+{
+  "homepage": "https://github.com/hermeticbuild/cuda_toolkit",
+  "maintainers": [
+    {
+      "name": "Corentin Kerisit",
+      "email": "corentin.kerisit@gmail.com",
+      "github": "cerisier"
+    },
+    {
+      "name": "David Zbarsky",
+      "email": "dzbarsky@gmail.com",
+      "github": "dzbarsky"
+    }
+  ],
+  "repository": [
+    "github:hermeticbuild/cuda_toolkit"
+  ],
+  "versions": [],
+  "yanked_versions": {}
+}

.bcr/presubmit.yml

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+bcr_test_module:
+  module_path: .
+  matrix:
+    bazel: [8.x, 9.x, rolling]
+    # Add macos_arm64 back when we support sdk discovery
+    platform: [debian11, ubuntu2004]
+  tasks:
+    run_test_module:
+      name: Run test module
+      bazel: ${{ bazel }}
+      platform: ${{ platform }}
+      build_targets:
+        - //:all

.bcr/source.template.json

@@ -0,0 +1,5 @@
+{
+  "integrity": "**leave this alone**",
+  "strip_prefix": "{REPO}-{VERSION}",
+  "url": "https://github.com/{OWNER}/{REPO}/releases/download/{TAG}/{REPO}-{TAG}.tar.gz"
+}