Added build script and GitHub workflow

Author: patrick-mahnkopf

.github/workflows/build.yml

@@ -0,0 +1,15 @@
+name: Package add-on
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  zip_job:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Run build script
+        run: ./build.sh

build.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+temp_dir=$(mktemp -d)
+cp *.py config.json LICENSE "$temp_dir"
+(cd "$temp_dir" && zip -r "$OLDPWD/MoreOverviewStats.ankiaddon" .)
+rm -rf "$temp_dir"