Add firebase hosting with ci

.firebaserc

@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "pia-dev-60cea"
+  }
+}

.github/workflows/build-and-deploy.yml

@@ -0,0 +1,50 @@
+name: Build and Deploy
+
+on:
+  workflow_call:
+    inputs:
+      environment:
+        required: true
+        type: string
+      firebaseProjectId:
+        required: true
+        type: string
+      firebaseHostingChannelId:
+        required: false
+        type: string
+
+jobs:
+  build_and_preview:
+    name: Build and Deploy
+    runs-on: ubuntu-latest
+    environment: ${{ inputs.environment }}
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+      - name: Create Frontend .env
+        run: |
+          cd frontend
+          touch .env
+          echo FIREBASE_CONFIG=${{ secrets.FIREBASE_CONFIG }} >> .env
+      - name: Create Backend .env
+        run: |
+          cd backend
+          touch .env
+          echo MONGO_URI=${{ secrets.MONGO_URI }} >> .env
+          echo SERVICE_ACCOUNT_KEY=${{ secrets.SERVICE_ACCOUNT_KEY }} >> .env
+          echo APP_PORT=${{ secrets.APP_PORT }} >> .env
+      - name: Build Frontend
+        run: cd frontend && npm ci && npm run build
+      - name: Build Backend
+        run: |
+          cd backend
+          npm run build
+      - name: Deploy to Firebase
+        uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          repoToken: "${{ secrets.GITHUB_TOKEN }}"
+          firebaseServiceAccount: "${{ secrets.FIREBASE_SERVICE_ACCOUNT_PIA_DEV_60CEA }}"
+          projectId: ${{ inputs.firebaseProjectId }}
+          channelId: ${{ inputs.firebaseHostingChannelId }}
+        env:
+          FIREBASE_CLI_EXPERIMENTS: pintags

.github/workflows/preview-deploy.yml

@@ -0,0 +1,13 @@
+name: Deploy Branch Preview
+on:
+  pull_request:
+
+jobs:
+  deploy_preview:
+    name: Deploy Branch Preview
+    if: "${{ github.event.pull_request.head.repo.full_name == github.repository }}"
+    uses: ./.github/workflows/build-and-deploy.yml
+    with:
+      environment: Preview
+      firebaseProjectId: pia-dev-60cea
+    secrets: inherit

.github/workflows/staging-deploy.yml

@@ -0,0 +1,15 @@
+name: Deploy to Staging
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy_staging:
+    name: Deploy to Staging
+    uses: ./.github/workflows/build-and-deploy.yml
+    with:
+      environment: Staging
+      firebaseProjectId: pia-dev-60cea
+      firebaseHostingChannelId: live
+    secrets: inherit

.gitignore

@@ -128,3 +128,6 @@ dist
 .yarn/build-state.yml
 .yarn/install-state.gz
 .pnp.*
+
+# Firebase
+.firebase