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.github/workflows/weekly_reduceimagesize.yml

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+# Compress images on demand (workflow_dispatch), and at 11pm every Sunday (schedule).
+# Open a Pull Request if any images can be compressed.
+---
+name: Compress Images
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '00 23 * * 0'
+
+jobs:
+  calibre:
+    name: calibreapp/image-actions
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+
+      - name: Compress Images
+        id: calibre
+        uses: calibreapp/image-actions@main
+        with:
+          # The `GITHUB_TOKEN` is automatically generated by GitHub and scoped only to the repository that is currently running the action. By default, the action can’t update Pull Requests initiated from forked repositories.
+          # See https://docs.github.com/en/actions/reference/authentication-in-a-workflow and https://help.github.com/en/articles/virtual-environments-for-github-actions#token-permissions
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          compressOnly: true
+          jpegQuality: '60'
+          jpegProgressive: false
+          pngQuality: '60'
+          webpQuality: '60'
+
+      - name: Commit if needed
+        if: steps.calibre.outputs.markdown != ''
+        uses: EndBug/add-and-commit@v9
+        with:
+          message: "Github bot : image compressed"
+          default_author: github_actions
+          body: ${{ steps.calibre.outputs.markdown }}