fix(ci): isolate docs lint pnpm version

.github/actions/lint-docs/action.yml

@@ -12,6 +12,7 @@ runs:
     - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
       with:
         version: 10.16.1
+        package_json_file: .volcano-docs-lint/no-package.json
 
     - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
       with:

.github/workflows/ci.yml

@@ -36,5 +36,8 @@ jobs:
       - name: Check links and routes
         run: pnpm check:links
 
+      - name: Test reusable actions
+        run: pnpm test:actions
+
       - name: Build
         run: pnpm build

package.json

@@ -16,6 +16,7 @@
     "lint:docs": "node scripts/lint-docs.mjs",
     "check:links": "node scripts/check-links.mjs content public",
     "check:search-index": "node scripts/check-search-index.mjs",
+    "test:actions": "node scripts/lint-docs-action.test.mjs",
     "verify": "node src/lib/relative-md-href.test.mjs && node scripts/lint-docs.mjs content && node scripts/check-links.mjs content public && pnpm build",
     "migrate:docs": "node scripts/migrate-docs.mjs"
   },

scripts/lint-docs-action.test.mjs

@@ -0,0 +1,26 @@
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+
+const action = await readFile(
+  new URL("../.github/actions/lint-docs/action.yml", import.meta.url),
+  "utf8",
+);
+const setup = action.match(
+  /- uses: pnpm\/action-setup@[^\n]+\n(?<inputs>(?: {6,}.+\n)*)/,
+);
+const packageJson = JSON.parse(
+  await readFile(new URL("../package.json", import.meta.url), "utf8"),
+);
+
+assert.ok(setup, "lint action must install pnpm");
+const version = setup.groups.inputs.match(/^ {8}version: (?<value>\S+)$/m);
+const manifest = setup.groups.inputs.match(
+  /^ {8}package_json_file: (?<value>\S+)$/m,
+);
+
+assert.ok(version, "lint action must pin pnpm explicitly");
+assert.equal(`pnpm@${version.groups.value}`, packageJson.packageManager);
+assert.ok(manifest, "lint action must isolate caller package metadata");
+assert.equal(manifest.groups.value, ".volcano-docs-lint/no-package.json");
+assert.equal(path.isAbsolute(manifest.groups.value), false);