fix: Pass GITHUB_TOKEN to lock-threads action

.github/workflows/main.yml

@@ -0,0 +1,36 @@
+name: Main workflow
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+
+    - name: Run tests
+      run: |
+        python -m unittest discover tests
+
+    - name: Lock threads
+      uses: dessant/lock-threads@v4
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}