chore: add compress workflow

Author: yanglbme

Diff for: .github/workflows/compress.yml

@@ -0,0 +1,36 @@
+name: Compress
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "**.jpg"
+      - "**.jpeg"
+      - "**.png"
+      - "**.webp"
+  workflow_dispatch:
+
+jobs:
+  compress:
+    runs-on: ubuntu-latest
+    if: github.repository == 'doocs/advanced-java'
+    steps:
+      - name: Checkout Branch
+        uses: actions/checkout@v2
+
+      - name: Compress Images
+        uses: calibreapp/image-actions@master
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}
+          compressOnly: true
+
+      - name: Commit Files
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git commit -m "docs: optimize images" -a
+
+      - name: Push Changes
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}