test: add vitest unit tests + CI for the GitHub Action

The action had no unit tests (the old `test` script only built and copied
dist into a sibling dir; preserved as `test:gha`). Add vitest and test
getParameters() via mocked @actions/core / @actions/github, covering the
input contract: app-file XOR app-binary-id, tag parsing, orientation /
download-artifacts / report validation, numeric coercion, boolean inputs,
device normalisation, default api-url + inferred name, and the
github-context metadata (including include-github-context=false).

A GitHub Actions workflow runs `pnpm test` on push/PR.

Author: finalerock44

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: Unit tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: pnpm/action-setup@v5
+        with:
+          run_install: false
+
+      - uses: actions/setup-node@v5
+        with:
+          node-version: '22'
+          cache: 'pnpm'
+          cache-dependency-path: './pnpm-lock.yaml'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run unit tests
+        run: pnpm test

package.json

@@ -10,7 +10,8 @@
   },
   "scripts": {
     "build": "ncc build",
-    "test": "pnpm run build && cp -r dist ../test-gha/gha && cp action.yml ../test-gha/gha"
+    "test": "vitest run",
+    "test:gha": "pnpm run build && cp -r dist ../test-gha/gha && cp action.yml ../test-gha/gha"
   },
   "dependencies": {
     "@actions/core": "^2.0.3",
@@ -23,7 +24,8 @@
     "@types/node": "^25.4.0",
     "@types/node-fetch": "^2.6.13",
     "@vercel/ncc": "^0.38.4",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "vitest": "^4.1.8"
   },
   "pnpm": {
     "overrides": {