Add configuration to mirror github releases to bazel central registry

.bcr/README.md

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+# Bazel Central Registry
+
+When the ruleset is released, we want it to be published to the
+Bazel Central Registry automatically:
+<https://registry.bazel.build>
+
+This folder contains configuration files to automate the publish step.
+See <https://github.com/bazel-contrib/publish-to-bcr/blob/main/templates/README.md>
+for authoritative documentation about these files.

.bcr/config.yml

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+fixedReleaser:
+  login: UebelAndre
+  email: 26427366+UebelAndre@users.noreply.github.com

.bcr/metadata.template.json

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+{
+  "homepage": "https://github.com/bazelbuild/rules_rust",
+  "maintainers": [
+    {
+        "email": "26427366+UebelAndre@users.noreply.github.com",
+        "github": "UebelAndre",
+        "name": "UebelAndre"
+    },
+    {
+      "email": "1131704+illicitonion@users.noreply.github.com",
+      "github": "illicitonion",
+      "name": "Daniel Wagner-Hall"
+    }
+  ],
+  "repository": ["github:bazelbuild/rules_rust"],
+  "versions": [],
+  "yanked_versions": {}
+}

.bcr/presubmit.yml

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+../.bazelci/presubmit.yml

.bcr/source.template.json

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