add extra dependencies and update github workflow

.github/workflows/python-package.yml

@@ -26,10 +26,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install setuptools wheel typing pillow numpy requests
-          python -m pip install -e .
-          python -m pip install ruff pytest
-          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+          python -m pip install -e .["testing"]
       - name: Lint with ruff
         run: |
           # Run Ruff for linting

setup.py

@@ -1,6 +1,7 @@
 import pathlib
 from setuptools import find_packages, setup
 
+
 def get_version() -> str:
     rel_path = "src/loadimg/__init__.py"
     with open(rel_path, "r") as fp:
@@ -10,6 +11,20 @@ def get_version() -> str:
                 return line.split(delim)[1]
     raise RuntimeError("Unable to find version string.")
 
+
+extras = {
+    "testing": [
+        "setuptools",
+        "wheel",
+        "typing",
+        "pillow",
+        "numpy",
+        "requests",
+        "ruff",
+        "pytest",
+    ]
+}
+
 setup(
     name="loadimg",
     version=get_version(),
@@ -24,6 +39,7 @@ def get_version() -> str:
     license="Apache 2.0 License",
     package_dir={"": "src"},
     packages=find_packages("src"),
+    extras_require=extras,
     include_package_data=True,
     classifiers=["Topic :: Utilities", "Programming Language :: Python :: 3.9"],
     requires=["setuptools", "wheel", "typing", "pillow", "numpy", "requests"],