add requirements.txt; update ci

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Run Python Tests
+name: Linting and Tests
 on:
   push:
     branches:
@@ -19,7 +19,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install markdown pdoc3 webencodings pyparsing twine autopep8 pylint pytest
+          pip install -r requirements.txt
+          pip install .
       - name: Run pylint
         run: pylint --exit-zero meshtastic
       - name: Run tests with pytest