[chore] Run flake8 for each pull request

.github/workflows/lint.yml

@@ -0,0 +1,26 @@
+name: Static analysis
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  flake8:
+    runs-on: ubuntu-latest
+
+    steps:
+        - uses: actions/checkout@v4
+        - uses: actions/setup-python@v5
+          with:
+            python-version: '3.11'
+        - name: Install dependencies
+          run: |
+            python -m pip install flake8
+        - name: Run flake8
+          run: |
+            # ignore errors for long lines and multi-statement lines
+            python -m flake8 --ignore=E501,E701,W503 speech_recognition tests examples setup.py