run android build only nightly and if changed

.github/workflows/android.yml

@@ -2,16 +2,19 @@ name: Android CI
 
 on:
   workflow_dispatch:
-  push:
-    branches:
-      - 'master'
-  pull_request:
-    branches-ignore:
-      - 'master'
-
+  schedule:
+    - cron: '0 22 * * *' # run at 0:00 GMT+2
 
 jobs:
+  hasChanged:
+    continue-on-error: true
+    name: Verify that changes have occured in the last 24h
+    if: ${{ github.event_name == 'schedule' }}
+    run: test -z $(git rev-list --after="24 hours" ${{ github.sha }}) && echo "::set-output name=hasChanged::false"
+
   createArtifacts:
+    needs: hasChanged
+    if: ${{ needs.hasChanged.outputs.hasChanged != 'false' }}
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3

README.md

@@ -3,6 +3,7 @@
 )](https://github.com/newhinton/Round-Sync/releases) [![GitHub release](https://img.shields.io/github/v/release/newhinton/Round-Sync?include_prereleases)](https://github.com/newhinton/Round-Sync/releases/latest)
 [![Documentation](https://img.shields.io/badge/Documentation-roundsync.com-4aad4e)](https://roundsync.com) [![supportive flags](https://img.shields.io/badge/support-🇺🇦_🏳️‍⚧_🏳️‍🌈-4aad4e)](https://roundsync.com)
 
+[![Android Lint](https://github.com/newhinton/Round-Sync/actions/workflows/lint.yml/badge.svg)](https://github.com/newhinton/Round-Sync/actions/workflows/lint.yml)
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