[GIT] initial BCR infra (#37)

* [GIT] initial BCR infra

* [GIT] fix release prep

.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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+# See https://github.com/bazel-contrib/publish-to-bcr#a-note-on-release-automation
+# for guidance about whether to uncomment this section:
+#
+# fixedReleaser:
+#   login: my_github_handle
+#   email: me@my.org

.bcr/metadata.template.json

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+{
+    "homepage": "https://github.com/hexdae/bazel_arm_toolchains",
+    "maintainers": {
+        "name": "Davide Asnaghi",
+        "github": "hexdae"
+    },
+    "repository": [
+        "github:hexdae/bazel_arm_toolchains"
+    ],
+    "versions": [],
+    "yanked_versions": {}
+}

.bcr/presubmit.yml

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+bcr_test_module:
+  module_path: "examples/bzlmod"
+  matrix:
+    platform: ["debian10", "macos", "ubuntu2004"]
+    bazel: ["7.x", "6.x"]
+  tasks:
+    run_tests:
+      name: "Run test module"
+      platform: ${{ platform }}
+      bazel: ${{ bazel }}
+      test_targets:
+        - "//..."

.bcr/source.template.json

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

.gitattributes

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+# In code review, collapse generated files
+MODULE.bazel.lock linguist-generated=true
+
+#################################
+# Configuration for 'git archive'
+# See https://git-scm.com/docs/git-archive#ATTRIBUTES
+
+# Don't include examples in the distribution artifact, to reduce size.
+# You may want to add additional exclusions for folders or files that users don't need.
+examples export-ignore

.github/workflows/release.yml

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+# Cut a release whenever a new tag is pushed to the repo.
+# You should use an annotated tag, like `git tag -a v1.2.3`
+# and put the release notes into the commit message for the tag.
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  release:
+    uses: bazel-contrib/.github/.github/workflows/release_ruleset.yaml@v6
+    with:
+      release_files: bazel-arm-none-eabi-*.tar.gz

.github/workflows/release_prep.sh

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+#!/usr/bin/env bash
+
+set -o errexit -o nounset -o pipefail
+
+# Set by GH actions, see
+# https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables
+TAG=${GITHUB_REF_NAME}
+# The prefix is chosen to match what GitHub generates for source archives
+# This guarantees that users can easily switch from a released artifact to a source archive
+# with minimal differences in their code (e.g. strip_prefix remains the same)
+PREFIX="bazel-arm-none-eabi-${TAG:1}"
+ARCHIVE="bazel-arm-none-eabi-$TAG.tar.gz"
+
+# NB: configuration for 'git archive' is in /.gitattributes
+git archive --format=tar --prefix=${PREFIX}/ ${TAG} | gzip > $ARCHIVE
+SHA=$(shasum -a 256 $ARCHIVE | awk '{print $1}')
+
+cat << EOF
+## Using Bzlmod with Bazel 6 or greater
+
+1. (Bazel 6 only) Enable with \`common --enable_bzlmod\` in \`.bazelrc\`.
+2. Add to your \`MODULE.bazel\` file:
+
+\`\`\`starlark
+bazel_dep(name = "arm_gnu_toolchain", version = "${TAG:1}")
+
+# Toolchains: arm-none-eabi
+arm_toolchain = use_extension("@arm_gnu_toolchain//:extensions.bzl", "arm_toolchain")
+arm_toolchain.arm_none_eabi(version = "13.2.1")
+use_repo(
+    arm_toolchain,
+    "arm_none_eabi",
+    "arm_none_eabi_darwin_arm64",
+    "arm_none_eabi_darwin_x86_64",
+    "arm_none_eabi_linux_aarch64",
+    "arm_none_eabi_linux_x86_64",
+    "arm_none_eabi_windows_x86_64",
+)
+
+register_toolchains("@arm_none_eabi//toolchain:all")
+
+# Toolchains: arm-none-linux-gnueabihf
+arm_toolchain.arm_none_linux_gnueabihf(version = "13.2.1")
+use_repo(
+    arm_toolchain,
+    "arm_none_linux_gnueabihf",
+    "arm_none_linux_gnueabihf_linux_aarch64",
+    "arm_none_linux_gnueabihf_linux_x86_64",
+    "arm_none_linux_gnueabihf_windows_x86_64",
+)
+
+register_toolchains("@arm_none_linux_gnueabihf//toolchain:all")
+\`\`\`
+EOF