Firebase deploy improvements (#1)

* create new preview channel per push
* deploy to live channel per push to main branch

.github/workflows/firebase-hosting-live-channel.yml

@@ -0,0 +1,17 @@
+name: Deploy commit to Firebase Hosting live channel
+'on':
+  push:
+   branches:
+    - master
+jobs:
+  build_and_deploy_to_live:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: npm install
+      - run: npm run build
+      - uses: w9jds/firebase-action@v2.0.0
+        with:
+          args: deploy --only hosting
+        env:
+          GCP_SA_KEY: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_FRED_CA431 }}'

.github/workflows/firebase-hosting-preview-channel.yml

@@ -0,0 +1,14 @@
+name: Deploy commit to new Firebase Hosting preview channel
+'on': push
+jobs:
+  build_and_deploy_to_preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: npm install
+      - run: npm run build
+      - uses: w9jds/firebase-action@v2.0.0
+        with:
+          args: hosting:channel:deploy preview-$GITHUB_SHA --expires 14d
+        env:
+          GCP_SA_KEY: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_FRED_CA431 }}'