wip: run presubmit CI in github actions

experimenting to potentially move off of bazelci, due to various challenges. this is a 1:1 representation of the presubmit.yml as-is, meaning buildifier hasn't been updated from 6.4.0, xcode is still 16.2, and pins for doc_tests are still in place. updating buildifier and moving the stardoc/doc_tests pins should be done in a separate PR, and potentially xcode 16.3 as well (this would also allow us to more easily test a matrix of xcodes, if desired).

Author: aaronsky

.github/workflows/BUILD

@@ -0,0 +1,8 @@
+load("@buildifier_prebuilt//:rules.bzl", "buildifier")
+
+buildifier(
+    name = "buildifier.check",
+    exclude_patterns = ["./.git/*"],
+    lint_mode = "warn",
+    mode = "diff",
+)

.github/workflows/presubmit.yml

@@ -0,0 +1,56 @@
+on:
+  push: ~
+  pull_request: ~
+  workflow_dispatch: ~
+
+# NOTE: To avoid listing the same things for build_flags/test_flags for each
+# of these tasks, they are listed in the .bazelrc instead.
+jobs:
+  macos:
+    runs-on: macos-15
+    strategy:
+      matrix:
+        bazel:
+          - latest
+          - last_rc
+          - last_green
+    env:
+      USE_BAZEL_VERSION: ${{ matrix.bazel }}
+    steps:
+      - uses: bazel-contrib/[email protected]
+        with:
+          bazelisk-cache: true
+          disk-cache: ${{ github.workflow }}
+          repository-cache: true
+          bazelrc: |
+            test --test_tag_filters=-skipci
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '16.2'
+      - uses: actions/checkout@v4
+      - run: bazel build //tools/... //test/...
+      - run: bazel test //tools/... //test/... //examples/...
+  doc_tests:
+    runs-on: ubuntu-latest
+    env:
+      # FIXME: Use last_green once we cherry-pick in changes needed by
+      # https://github.com/bazelbuild/bazel/commit/b59004dd17366b09b0758b833f98294fd0e89345
+      # USE_BAZEL_VERSION: last_green
+      USE_BAZEL_VERSION: 21a12c72d84e9108142421d9a8526edf8dceb78c
+    steps:
+      - uses: bazel-contrib/[email protected]
+        with:
+          bazelisk-cache: true
+          disk-cache: ${{ github.workflow }}
+          repository-cache: true
+          # TODO: Remove this once stardoc is updated to 0.7.1+ (https://github.com/bazelbuild/stardoc/pull/238)
+          bazelrc: |
+            test --noincompatible_disallow_empty_glob
+      - uses: actions/checkout@v4
+      - run: bazel test //doc/...
+  buildifier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: buildifier
+        run: bazel run --enable_bzlmod //.github/workflows:buildifier.check

MODULE.bazel

@@ -28,6 +28,11 @@ bazel_dep(
     dev_dependency = True,
     repo_name = "com_google_protobuf",
 )
+bazel_dep(
+    name = "buildifier_prebuilt",
+    version = "7.1.2",
+    dev_dependency = True,
+)
 
 non_module_deps = use_extension("//apple:extensions.bzl", "non_module_deps")
 use_repo(