ci(*): added workflows and issues templates

Author: dackers86

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+<!-- Step 1 [READ THIS] -->
+<!--
+Are you in the right place?
+  * For issues or feature requests related to __the code in this repository__
+    file a Github issue.
+    * If this is a __feature request__ make sure the issue title starts with "FR:".
+  * For general technical questions, post a question on [StackOverflow](http://stackoverflow.com/)
+    with the firebase-authentication tag.
+  * For general Firebase discussion, use the [firebase-talk](https://groups.google.com/forum/#!forum/firebase-talk)
+    google group.
+  * For help troubleshooting your application that does not fall under one
+    of the above categories, reach out to the personalized
+    [Firebase support channel](https://firebase.google.com/support/).
+-->
+
+<!-- Step 2 -->
+
+### [REQUIRED] Describe your environment
+
+- Operating System version: **\_**
+- Browser version: **\_**
+- Firebase UI version: **\_**
+- Firebase SDK version: **\_**
+
+<!-- Step 3 -->
+
+### [REQUIRED] Describe the problem
+
+#### Steps to reproduce:
+
+<!--
+  What happened? How can we make the problem occur?
+  This could be a description, log/console output, etc.
+-->
+
+#### Relevant Code:
+
+<!--
+  Reproduce the issue on StackBlitz and provide your forked URL
+  or give us some sample code below
+-->
+
+https://stackblitz.com/fork/firebase-issue-sandbox
+
+```javascript
+// TODO(you): code here to reproduce the problem
+```

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/test.yaml

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+name: Test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - "**"
+
+env:
+  SAUCE_USERNAME: ${{secrets.SAUCE_USERNAME}}
+  SAUCE_ACCESS_KEY: ${{secrets.SAUCE_ACCESS_KEY}}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup node
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: '18'
+          check-latest: true
+      - name: node_modules cache
+        id: node_modules_cache
+        uses: actions/cache@v2
+        with:
+          path: ./node_modules
+          key: ${{ runner.os }}-18-node_modules-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-18-node_modules-
+      - name: NPM install
+        if: steps.node_modules_cache.outputs.cache-hit != 'true'
+        run: npm ci
+      - name: Build & run tests
+        run: npm run test
+      - name: Run tests in Saucelabs
+        run: |
+          ./buildtools/sauce_connect.sh &
+          ./buildtools/run_tests.sh --saucelabs