Add publish-to-bcr support

Author: jwnimmer-tri

.bcr/config.yml

@@ -0,0 +1,16 @@
+{
+    "homepage": "https://github.com/RobotLocomotion/ruff_prebuilt",
+    "maintainers": [
+        {
+            "email": "[email protected]",
+            "github": "jwnimmer-tri",
+            "github_user_id": 17596505,
+            "name": "Jeremy Nimmer"
+        }
+    ],
+    "repository": [
+        "github:RobotLocomotion/ruff_prebuilt"
+    ],
+    "versions": [],
+    "yanked_versions": {}
+}

.bcr/metadata.template.json

@@ -0,0 +1,16 @@
+matrix:
+  platform:
+  - debian11
+  - ubuntu2404
+  - macos
+  - macos_arm64
+  - windows
+  bazel:
+  - 8.x
+tasks:
+  verify_targets:
+    name: Verify build targets
+    platform: ${{ platform }}
+    bazel: ${{ bazel }}
+    build_targets:
+    - '@ruff_prebuilt//:ruff'

.bcr/presubmit.yml

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

.bcr/source.template.json

@@ -0,0 +1,19 @@
+name: Publish to BCR
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag_name:
+        required: true
+        type: string
+jobs:
+  publish:
+    uses: bazel-contrib/publish-to-bcr/.github/workflows/[email protected]
+    with:
+      tag_name: ${{ inputs.tag_name }}
+      registry_fork: jwnimmer-tri/bazel-central-registry
+      attest: false
+    permissions:
+      contents: write
+    secrets:
+      publish_token: ${{ secrets.BCR_PUBLISH_TOKEN }}