ci: add GitHub Actions CI, Release Please, and Firebase deploy

* Add CI/CD pipeline with GitHub Actions and Firebase Hosting

- CI workflow: lint and test on PRs to master
- Release Please workflow: automated release PRs and versioning
- Deploy workflow: build and deploy to Firebase on version tags
- Firebase Hosting config with SPA rewrite and cache headers

* ci: rename CI workflow to Lint & Test

* ci: add workflow_dispatch trigger to deploy workflow

Author: lloydevans

.firebaserc

@@ -0,0 +1,5 @@
+{
+	"projects": {
+		"default": "minesweeper-fe661"
+	}
+}

.github/workflows/ci.yml

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+name: Lint & Test
+
+on:
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+
+      - run: npm ci
+      - run: npm run lint
+      - run: npm test

.github/workflows/deploy.yml

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+name: Deploy
+
+on:
+  push:
+    tags: ["v*"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+
+      - run: npm ci
+      - run: npm run build
+
+      - uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          repoToken: ${{ secrets.GITHUB_TOKEN }}
+          firebaseServiceAccount: ${{ secrets.FIREBASE_SERVICE_ACCOUNT }}
+          channelId: live
+          projectId: minesweeper-fe661

.github/workflows/release-please.yml

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+name: Release Please
+
+on:
+  push:
+    branches: [master]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json

.nvmrc

@@ -0,0 +1 @@
+20

.release-please-manifest.json

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+{
+	".": "0.0.0"
+}

firebase.json

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+{
+	"hosting": {
+		"public": "build",
+		"ignore": ["firebase.json", "**/.*", "**/node_modules/**"],
+		"rewrites": [
+			{
+				"source": "**",
+				"destination": "/index.html"
+			}
+		],
+		"headers": [
+			{
+				"source": "**/*.@(js|css)",
+				"headers": [
+					{
+						"key": "Cache-Control",
+						"value": "public, max-age=31536000, immutable"
+					}
+				]
+			},
+			{
+				"source": "**/*.@(png|jpg|jpeg|gif|svg|webp|mp3|ogg|wav|json)",
+				"headers": [
+					{
+						"key": "Cache-Control",
+						"value": "public, max-age=86400"
+					}
+				]
+			}
+		]
+	}
+}

release-please-config.json

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+{
+	"packages": {
+		".": {
+			"release-type": "node",
+			"bump-minor-pre-major": true,
+			"bump-patch-for-minor-pre-major": true,
+			"changelog-path": "CHANGELOG.md"
+		}
+	},
+	"$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
+}