Implemented workflow to fetch pypi updates

.github/workflows/fetch_pypi_updates.yml

@@ -0,0 +1,37 @@
+name: Fetch Package Updates on Pypi
+
+on: 
+  workflow_dispatch:
+  schedule:
+    - cron: '0 12 * * 0'
+
+jobs:
+  validate:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Execute validate.py
+      run: |
+        python ./src/pymodaq_plugin_manager/validate.py
+    - name: Commit files
+      run: |
+        git config --local user.name "rgeneaux"
+        git add .
+        if ! git diff-index --quiet HEAD; then
+          git commit -m "Auto-update package list"
+        fi
+    - name: Push changes
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+        force: true