Add flutter hash fetcher.

Author: zhaobozhen

.github/workflows/fetch_flutter_snapshot_hash.yml

@@ -0,0 +1,32 @@
+name: Generate Files from Flutter JSON
+
+on:
+  schedule:
+    - cron: "0 2 * * *"
+  workflow_dispatch:
+
+jobs:
+  generate_files:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.x
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests
+
+      - name: Generate Files
+        run: |
+            python flutter_hash/tools/fetcher.py
+
+      - name: Commit & Push changes
+        uses: actions-js/push@master
+        with:
+            github_token: ${{ secrets.GITHUB_TOKEN }}

flutter_hash/tools/fetcher.py

@@ -0,0 +1,25 @@
+import json
+import os
+
+import requests
+
+url = 'https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json'
+response = requests.get(url)
+
+if response.status_code == 200:
+    data = json.loads(response.text)
+    hash_list = data['releases']
+
+    folder_path = '../hash'
+    os.makedirs(folder_path, exist_ok=True)
+
+    for item in hash_list:
+        hash_value = item['hash']
+        file_path = os.path.join(folder_path, f'{hash_value}.json')
+
+        if not os.path.exists(file_path):
+            with open(file_path, 'w') as f:
+                json.dump(item, f)
+                print(f"Saved {file_path}")
+else:
+    print(f"Failed to retrieve data. Status code: {response.status_code}")