Fixing the tests - adding samtools to the conda environment seems to …

…make pysam functional again

.github/workflows/python-package.yml

@@ -62,6 +62,7 @@ jobs:
       run: |
         gcc --help
         pip install -r requirements.txt
+        python -c "import pysam; print(pysam.__version__)"	
         pip install Cython pytest-cov
         python setup.py develop
     - name: Test light

environment.yml

@@ -17,6 +17,8 @@ dependencies:
   - pandas>=1.0
   - pip
   - pyfaidx>=0.5.8
+  - samtools>=1.11
+  - htslib>=1.11
   - pysam>=0.15.3
   - defaults::python>=3.6
   - pyyaml>=5.1.2