chore(lint-pr-title): use text lockfile, specify bun version in separ…

…ate file (#702)

Renovate isn't currently updating the Bun version we're using for this
workflow. That's because we give it in `packageManagers` but it's [not a
supported Corepack package manager][package-managers]. [It does, however,
support updating a `.bun-version` file.][renovate-bun-version] We can
switch to putting our version in that and enable the manager. We've
given `1.1.43` as the version even though `1.1.44` is the newest right
now, so we can see if the update is raised properly.

In `1.1.39` a [new, faster, diffable, text-based lockfile format was
introduced][lockfile-format]. We can switch to that too.

[lockfile-format]: https://bun.sh/blog/bun-lock-text-lockfile#cached-bun-install-gets-30-faster
[package-managers]: https://nodejs.org/api/corepack.html#supported-package-managers
[renovate-bun-version]: https://docs.renovatebot.com/modules/manager/bun-version/

.github/renovate-config.json5

@@ -14,7 +14,13 @@
     },
   ],
   dependencyDashboard: false,
-  enabledManagers: ["bun", "custom.regex", "github-actions", "npm"],
+  enabledManagers: [
+    "bun",
+    "bun-version",
+    "custom.regex",
+    "github-actions",
+    "npm",
+  ],
   forkProcessing: "enabled",
   globalExtends: [":pinDependencies", "config:best-practices"],
   onboarding: false,

.github/workflows/test-lint-pr-title.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Install bun package manager
         uses: oven-sh/setup-bun@4bc047ad259df6fc24a6c9b0f9a0cb08cf17fbe5 # v2.0.1
         with:
-          bun-version-file: "actions/lint-pr-title/package.json"
+          bun-version-file: actions/lint-pr-title/.bun-version
 
       - name: Install lint-pr-title dependencies
         run: bun install --frozen-lockfile

actions/lint-pr-title/.bun-version

@@ -0,0 +1 @@
+1.1.43

actions/lint-pr-title/action.yml

@@ -18,7 +18,7 @@ runs:
     - name: Install bun package manager
       uses: oven-sh/setup-bun@4bc047ad259df6fc24a6c9b0f9a0cb08cf17fbe5 # v2.0.1
       with:
-        bun-version-file: actions/lint-pr-title/package.json
+        bun-version-file: actions/lint-pr-title/.bun-version
 
     - name: Install dependencies
       shell: sh

actions/lint-pr-title/package.json

@@ -45,6 +45,5 @@
     "prettier": "3.4.2",
     "typescript": "5.7.3",
     "typescript-eslint": "8.21.0"
-  },
-  "packageManager": "[email protected]"
+  }
 }