update CI

scripts/README.md

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+# Usage
+[build_exiv2.sh](build_exiv2.sh): Used to build thirdparty library.
+[get_cache_key.py](get_cache_key.py): Used to get cache's key which used in [action/cache](https://github.com/actions/cache).

scripts/build_exiv2.sh

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+export PREFIX=`pwd`/clib
+mkdir -p cbuild && cd cbuild || exit 1
+git clone --depth 1 'https://github.com/Exiv2/exiv2' && cd exiv2 || exit 1
+mkdir -p build && cd build || exit 1
+cmake -DCMAKE_BUILD_TYPE=Release "-DCMAKE_INSTALL_PREFIX=$PREFIX" ../ || exit 1
+make -j8 && make install || exit 1

scripts/get_cache_key.py

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+from argparse import ArgumentParser
+from hashlib import sha256 as _sha256
+import sys
+from time import gmtime, time, strftime
+from typing import List
+
+
+ALL_FEATURES = ['exiv2']
+
+def sha256(data) -> str:
+    if isinstance(data, str):
+        data = data.encode()
+    elif not isinstance(data, bytes):
+        data = str(data).encode()
+    s = _sha256()
+    s.update(data)
+    return s.hexdigest()
+
+
+try:
+    p = ArgumentParser(description='Get the cache key which used in action/cache')
+    p.add_argument("features", help="The feature's name", action='append', nargs='+', choices=['all'] + ALL_FEATURES)
+    args = p.parse_intermixed_args(sys.argv[1:])
+    features: List[str] = args.features
+    if 'all' in features:
+        features = ALL_FEATURES.copy()
+    d = ''
+    now = time()
+    for i in features:
+        dt = strftime('%Y-%m', gmtime(now))
+        d += f"i={dt}"
+    print(f"::set-output name=cache_key::{sha256(d)}")
+except Exception:
+    from traceback import print_exc
+    from sys import exit
+    print_exc()
+    exit(1)