Add image compression step

.github/workflows/compress-images.yml

@@ -0,0 +1,26 @@
+name: Compress Images
+on:
+    pull_request:
+        # Run Image Actions when JPG, JPEG, PNG or WebP files are added or changed.
+        # See https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#onpushpull_requestpaths for reference.
+        paths:
+            - '**.jpg'
+            - '**.jpeg'
+            - '**.png'
+            - '**.webp'
+jobs:
+    build:
+        # Only run on Pull Requests within the same repository, and not from forks.
+        if: github.event.pull_request.head.repo.full_name == github.repository
+        name: calibreapp/image-actions
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout Repo
+              uses: actions/checkout@v2
+
+            - name: Compress Images
+              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 }}