Add python version file

Author: gabrieltseng

.github/workflows/publish.yml

@@ -24,11 +24,11 @@ jobs:
       - uses: actions/checkout@v5
         with:
           ref: ${{ github.event.inputs.tag || github.ref }}
-      
+
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.12"
+          python-version: ".python-version"
 
       - name: Verify version matches tag
         run: |

.python_version

@@ -0,0 +1 @@
+3.12