Add Publish to BCR setup (#518)

* Add Publish to BCR setup

* Update maintainers guide

* Add maintainers

.bcr/config.yml

@@ -0,0 +1,4 @@
+moduleRoots:
+  - "."
+  - "gazelle"
+

.bcr/metadata.template.json

@@ -0,0 +1,15 @@
+{
+  "homepage": "https://github.com/bazelbuild/bazel-skylib",
+  "maintainers": [
+    {
+      "email": "ilist@google.com",
+      "github": "comius",
+      "name": "Ivo Ristovski List"
+    }
+  ],
+  "versions": [],
+  "yanked_versions": {},
+  "repository": [
+    "github:bazelbuild/bazel-skylib"
+  ]
+}

.bcr/presubmit.yml

@@ -0,0 +1,18 @@
+matrix:
+  platform:
+  - centos7
+  - debian10
+  - macos
+  - ubuntu2004
+  - windows
+  bazel:
+  - 7.x
+  - 6.x
+  - 5.x
+tasks:
+  verify_build_targets:
+    name: "Verify build targets"
+    platform: ${{ platform }}
+    bazel: ${{ bazel }}
+    build_targets:
+    - "@bazel_skylib//..."

.bcr/source.template.json

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

docs/maintainers_guide.md

@@ -54,7 +54,8 @@ file under `docs` (generated by `bazel run //docs:update`).
 
 --------------------------------------------------------------------------------
 
-Release $VERSION
+```
+# Release $VERSION
 
 **New Features**
 
@@ -69,6 +70,7 @@ Release $VERSION
 **Contributors**
 
 Name 1, Name 2, Name 3 (alphabetically from `git log`)
+```
 
 --------------------------------------------------------------------------------
 
@@ -148,32 +150,13 @@ See [the source](https://github.com/bazelbuild/bazel-skylib/tree/$VERSION).
 
 --------------------------------------------------------------------------------
 
-8.  Obtain [Subresource Integrity](https://w3c.github.io/webappsec-subresource-integrity/#integrity-metadata-description)
-    format checksums for bzlmod:
-
-```bash
-echo -n sha256-; cat bazel-bin/distribution/bazel-skylib-$VERSION.tar.gz | openssl dgst -sha256 -binary | base64
-echo -n sha256-; cat bazel-bin/distribution/bazel-skylib-gazelle-plugin-$VERSION.tar.gz | openssl dgst -sha256 -binary | base64
-```
-
-9.  Create a PR at [Bazel Central Registry](https://github.com/bazelbuild/bazel-central-registry)
-    to update the registry's versions of bazel_skylib and
-    bazel_skylib_gazelle_plugin.
+8.  Review a PR at [Bazel Central Registry](https://github.com/bazelbuild/bazel-central-registry)
+    created by Publish-to-BCR plugin.
 
     Use https://github.com/bazelbuild/bazel-central-registry/pull/403 as the
-    model; you will need to update `modules/bazel_skylib/metadata.json` and
-    `modules/bazel_skylib_gazelle_plugin/metadata.json` to list the new version
-    in `versions`, and create new $VERSION subdirectories for the updated
-    modules, using the latest existing version subdirectories as the guide. Use
-    Subresource Integrity checksums obtained above in the new `source.json`
-    files.
-
-    Ensure that the MODULE.bazel files you add in the new $VERSION
-    subdirectories exactly match the MODULE.bazel file packaged in
-    bazel-skylib-$VERSION.tar.gz and bazel-skylib-gazelle-plugin-$VERSION.tar.gz
-    tarballs - or buildkite checks will fail.
-
-10. Once the Bazel Central Registry PR is merged, insert in the release
+    model.
+
+9.  Once the Bazel Central Registry PR is merged, insert in the release
     description after the WORKSPACE setup section:
 
 --------------------------------------------------------------------------------