test: add test data for act

Signed-off-by: Yukai Huang <yukaihuangtw@gmail.com>

Author: Yukaii

.github/tests/README.md

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+# Test github actions with act
+
+```bash
+act pull_request --container-architecture linux/arm64 -e .github/tests/pull-request.json -j ch
+eck-release-pr -P ubuntu-latest=catthehacker/ubuntu:act-latest
+```

.github/tests/pull-request.json

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+{
+  "pull_request": {
+    "head": {
+      "ref": "release/1.2.3"
+    },
+    "base": {
+      "ref": "master"
+    }
+  }
+}