Add CI to automatically update plugin stub in template

.github/workflows/edit-check.yml

@@ -0,0 +1,47 @@
+name: Push Updated Plugin Stub to Template
+
+on: push
+
+jobs:
+  copy-stub:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@8230315d06ad95c617244d2f265d237a1682d445
+      with:
+        ref: ${{ github.sha }}
+        fetch-depth: 0
+        token: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Checkout
+      uses: actions/checkout@v2
+      
+    - name: Is stub changed
+      id: changed-stub
+      run: |
+        STUB_CHANGED="false"
+        PATHS=(plugin plugin/decky_plugin.pyi)
+        SHA=${{ github.sha }}
+        SHA_PREV=$(git rev-list --parents -n 1 $SHA)
+        FILES=$(git diff $SHA_PREV..$SHA --name-only -- ${PATHS[@]} | jq -Rsc 'split("\n")[:-1] | join (",")')
+        if [[ "$FILES" == *"plugin/decky_plugin.pyi"* ]]; then
+          $STUB_CHANGED="true"
+          echo "Stub has changed, pushing updated stub"
+        else
+          echo "Stub has not changed, exiting."
+          echo "has_changed=$STUB_CHANGED" >> $GITHUB_OUTPUT
+          exit 0
+        fi
+        echo "has_changed=$STUB_CHANGED" >> $GITHUB_OUTPUT
+
+    - name: Push updated stub
+      if: steps.changed-stub.outputs.has_changed == true
+      uses: dmnemec/copy_file_to_another_repo_action@bbebd3da22e4a37d04dca5f782edd5201cb97083
+      env:
+        API_TOKEN_GITHUB: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        source_file: 'plugin/decky_plugin.pyi'
+        destination_repo: 'SteamDeckHomebrew/decky-plugin-template'
+        user_email: '11465594+TrainDoctor@users.noreply.github.com'
+        user_name: 'TrainDoctor'
+        commit_message: 'Updated template with latest plugin stub changes'