Explicitly tell setuptools what is the package rather than relying on auto-discovery

Author: Baharis

pyproject.toml

@@ -129,10 +129,13 @@ publishing = [
 "instamatic.autoconfig" = "instamatic.config.autoconfig:main"
 
 [tool.setuptools]
-packages = ["instamatic"]
 package-dir = {"" = "src"}
 include-package-data = true
 
+[tool.setuptools.packages.find]
+where = ["src"]
+include = ["instamatic*"]
+
 [tool.ruff]
 target-version = 'py39'
 line-length = 96