Refactor dependency installation in GitHub Actions workflow

Author: robindust-ce

.github/workflows/tests.yaml

@@ -12,12 +12,13 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.8'
 
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pillow numpy pathlib scikit-image argparse vunit_hdl
+          pip install pillow numpy pathlib scikit-image argparse
+          pip install vunit_hdl --pre
 
       - uses: ghdl/setup-ghdl@v1
         with:

scripts/run.py

@@ -102,6 +102,7 @@ def generate_tests(obj):
 
 
 VU = VUnit.from_argv()
+VU.add_vhdl_builtins()
 LIB = VU.add_library("lib")
 LIB.add_source_files(Path(__file__).parent / ".." / "sim" / "edgedetect_tb.vhd")
 LIB.add_source_files(Path(__file__).parent / ".." / "src" / "rgb2gray.vhd")