Simplify for GHCR-only builds, fix workflow bugs, remove deb/mirror/dockerhub

.github/workflows/update-check.yaml

@@ -1,24 +1,19 @@
 name: update check
 
 on:
-  push:
-    paths:
-      - .github/workflows/update-check.yaml
-      - update-check.py
-  pull_request:
-    paths:
-      - .github/workflows/update-check.yaml
-      - update-check.py
   schedule:
-  - cron: '0 0 * * *'  # runs everyday at midnight
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
 
 jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - name: Checkout
-      uses: actions/checkout@master
-      with:
-        token: ${{ secrets.PERSONAL_TOKEN }}
-    - name: Check Update
-      run: python3 update-check.py ${{ github.event_name == 'pull_request' }}
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check for update
+        run: python3 update-check.py