Add image-action to compress images (#83)

Optimised images with calibre/image-actions

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: chenrui333

.github/calibre/image-actions.yml

@@ -0,0 +1,9 @@
+# https://github.com/marketplace/actions/image-actions
+jpeg:
+  quality: 80
+png:
+  quality: 100
+webp:
+  quality: 80
+ignorePaths:
+  - "node_modules/**"

.github/workflows/image-action.yml

@@ -0,0 +1,15 @@
+# https://github.com/marketplace/actions/image-actions
+name: Compress images
+
+on: pull_request
+
+jobs:
+  build:
+    name: calibreapp/image-actions
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: calibreapp/image-actions
+        uses: docker://calibreapp/github-image-actions
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}