Add BCR publishing configuration for Bazel Central Registry

[Copilot]

Enables automatic publishing to the Bazel Central Registry when version tags are pushed, making the module available for consumption via bzlmod.

Changes

• .bcr/ directory: BCR template files

  • metadata.template.json: Repository metadata and maintainers
  • source.template.json: GitHub auto-generated archive URLs (archive/refs/tags/v{VERSION}.tar.gz)
  • presubmit.yml: Build verification matrix across Debian, Ubuntu, macOS on Bazel 7.x/8.x/9.*
  • README.md: Maintainer setup guide (BCR fork, PAT creation, secret configuration)

• .github/workflows/publish-to-bcr.yml: GitHub Actions workflow

  • Triggers on v*.*.* tags
  • Uses bazel-contrib/[email protected] reusable workflow
  • Requires BCR_PUBLISH_TOKEN secret

Target registry: https://github.com/bazelbuild/bazel-central-registry

Setup Required

Maintainers must:

1. Fork bazelbuild/bazel-central-registry
2. Create classic PAT with repo and workflow scopes
3. Add as BCR_PUBLISH_TOKEN repository secret

See .bcr/README.md for detailed instructions.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/mmorel-35/proxy-wasm-rust-sdk/contents/.bcr
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)
• https://api.github.com/repos/mmorel-35/proxy-wasm-rust-sdk/git/trees/92d566026a6778667b88188b81ff5a24c658a9cf
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)
• https://api.github.com/users/PiotrSikora
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)
• releases.bazel.build
  • Triggering command: /usr/local/lib/node_modules/@bazel/bazelisk/bazelisk-linux_amd64 /usr/local/lib/node_modules/@bazel/bazelisk/bazelisk-linux_amd64 query //... (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Please provide BCR config and workflow as in mmorel-35/proxy-wasm-rust-sdk@92d5660 for https://github.com/proxy-wasm/proxy-wasm-cpp-host , the targeted registry has to be https://github.com/bazelbuild/bazel-central-registry . Provide README in '.bcr' to help project maintainer to follow right process. See https://github.com/bazel-contrib/publish-to-bcr/ for reference

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