add image compression

.github/workflows/image.yml

@@ -0,0 +1,18 @@
+name: Compress images
+on: [push]
+  paths:
+    - '**.jpg'
+    - '**.png'
+    - '**.webp'
+jobs:
+  build:
+    name: calibreapp/image-actions
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@master
+
+      - name: Compress Images
+        uses: calibreapp/image-actions@master
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}