[sdlf-foundations][cdk] avoid using a hardcoded stack name

sdlf-foundations/src/app.py

@@ -1,11 +1,22 @@
 #!/usr/bin/env python3
 
 import aws_cdk as cdk
+import os
 
 from foundations import Foundations
 
+# Project specific
+project_name = os.getenv("SEEDFARMER_PROJECT_NAME", "")
+deployment_name = os.getenv("SEEDFARMER_DEPLOYMENT_NAME", "")
+module_name = os.getenv("SEEDFARMER_MODULE_NAME", "")
+
+if project_name:
+    stack_name = f"{project_name}-{deployment_name}-{module_name}"
+else:  # app.py not used in a seedfarmer context somehow
+    stack_name = "sdlf-foundations"
+
 app = cdk.App()
-stack = cdk.Stack(app, "FoundationsStack")
+stack = cdk.Stack(app, stack_name)
 Foundations(stack, "foundations")
 
 app.synth()