ci: Use pull_request instead of pull_request_target in compatibility action

.github/workflows/check_compatibility.yml

@@ -0,0 +1,44 @@
+name: Check compatibility
+
+on:
+  pull_request:
+
+jobs:
+  check-compatibility:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the PR
+        uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+
+      - name: Extract PR public interfaces
+        run: |
+          make init
+          bin/public_interface.py extract > "${{ runner.temp }}"/interfaces.new.json
+
+      - name: Backup PR bin/public_interface.py
+        run: |
+          # Keep a copy of bin/public_interface.py
+          # So we are using the same bin/public_interface.py to process old/new codebase.
+          cp bin/public_interface.py "${{ runner.temp }}"/public_interface.py
+
+      - name: Checkout the base
+        uses: actions/checkout@v3
+        with:
+          ref: "${{ github.base_ref }}"
+
+      - name: Extract original public interfaces
+        run: |
+          make init
+          # Recover bin/public_interface.py
+          cp "${{ runner.temp }}"/public_interface.py bin/public_interface.py
+          bin/public_interface.py extract > "${{ runner.temp }}"/interfaces.original.json
+
+      - name: Detect compatibility breaking changes
+        id: detect
+        run: |
+          bin/public_interface.py check "${{ runner.temp }}"/interfaces.original.json "${{ runner.temp }}"/interfaces.new.json