Adding sanity check workflow

.github/workflows/test.yml

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+name: Run sanity check
+
+on:
+  push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.11
+    - name: Set PYTHONPATH
+      run: echo "PYTHONPATH=/home/runner/work/CU-GIR/CU-GIR" >> $GITHUB_ENV
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install stix2==3.0.1 pytest
+    - name: Test with pytest
+      run: |
+        pytest

.gitignore

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+.idea
+tests/__pycache__

tests/test_sanity.py

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+import json
+import os
+
+import pytest
+from stix2 import parse
+
+
+HERE = os.path.dirname(os.path.realpath(__file__))
+with open(os.path.join(HERE, "..", "STIX", "Current", "intel471_cu-gir.json")) as fh:
+    girs = json.load(fh)
+
+
+@pytest.mark.parametrize("gir", girs)
+def test_sanity(gir):
+    parse(gir, allow_custom=True)
+
+