Draft: esd-spack-installation: added abstract methods for spack manager and added...

esd-spack-installation: added abstract methods for spack manager and added ci/cd testing for spack installation

esd/model/SpackModel.py

+from pathlib import Path
+
+
+class SpackModel:
+    """"
+    Provides details about the spack environment
+    """
+
+    def __init__(self, env_name: str, path: Path, git_path: str = None):
+        self.name = env_name
+        self.path = path
+        self.git_path = git_path