Add buildifier_prebuilt to facilitate running buildifier (#242)

When implementing #241 , I ran into a buildifier error and didn't have a
good way for running it locally to address the CI errors. To make
developers more consistent with CI, this introduces
[buildifier_prebuilt](https://github.com/keith/buildifier-prebuilt) as a
development dependency and sets up `buildifier.[check|diff|fix]` rules
in `BUILD.bazel` to run. CI now runs `bazel run //:buildifier.check` and
developers can run `bazel run //:buildifier.fix` to apply the changes.

Author: nate-england

.github/workflows/ci.yaml

@@ -123,20 +123,13 @@ jobs:
         env:
           USE_BAZEL_VERSION: 7.x
 
-
   ci-buildifier:
     runs-on: ubuntu-latest
     steps:
       # Checkout the code
       - uses: actions/checkout@v4
       - name: Buildifier
-        run: |
-          wget "https://github.com/bazelbuild/buildtools/releases/download/v${BUILDIFIER_VERSION}/buildifier-linux-amd64" -O buildifier
-          chmod +x ./buildifier
-          ./buildifier -lint=warn -mode=check -warnings=all -r ${{ github.workspace }}
-          rm ./buildifier
-        env:
-          BUILDIFIER_VERSION: 8.0.2
+        run: bazel run //:buildifier.check
 
   ci-gofmt:
     runs-on: ubuntu-latest

BUILD.bazel

@@ -1,5 +1,20 @@
 load("@gazelle//:def.bzl", "gazelle")
 
+alias(
+    name = "buildifier.check",
+    actual = "//tools/buildifier:check",
+)
+
+alias(
+    name = "buildifier.diff",
+    actual = "//tools/buildifier:diff",
+)
+
+alias(
+    name = "buildifier.fix",
+    actual = "//tools/buildifier:fix",
+)
+
 exports_files(
     [
         "README.md",

MODULE.bazel

@@ -20,6 +20,7 @@ bazel_dep(name = "rules_img", version = "0.2.6", dev_dependency = True)
 bazel_dep(name = "stardoc", version = "0.8.0", dev_dependency = True)
 bazel_dep(name = "rules_rust_mdbook", version = "0.66.0", dev_dependency = True)
 bazel_dep(name = "rules_shell", version = "0.5.1", dev_dependency = True)
+bazel_dep(name = "buildifier_prebuilt", version = "8.5.1", dev_dependency = True)
 
 go_sdk = use_extension("@rules_go//go:extensions.bzl", "go_sdk")
 go_sdk.download(version = "1.25.4")

tools/buildifier/BUILD.bazel

@@ -0,0 +1,33 @@
+load("@buildifier_prebuilt//:rules.bzl", "buildifier")
+
+package(default_visibility = ["//:__subpackages__"])
+
+buildifier(
+    name = "check",
+    exclude_patterns = [
+        "./.git/*",
+    ],
+    lint_mode = "warn",
+    lint_warnings = ["all"],
+    mode = "check",
+)
+
+buildifier(
+    name = "diff",
+    exclude_patterns = [
+        "./.git/*",
+    ],
+    lint_mode = "warn",
+    lint_warnings = ["all"],
+    mode = "diff",
+)
+
+buildifier(
+    name = "fix",
+    exclude_patterns = [
+        "./.git/*",
+    ],
+    lint_mode = "fix",
+    lint_warnings = ["all"],
+    mode = "fix",
+)