Add support for .tool-versions file in setup-python (#1043)

* add support for .tool-versions file

* update regex

* optimize code

* update test-python.yml for .tool-versions

* fix format-check errors

* fix formatting in test-python.yml

* Fix test-python.yml error

* workflow update with latest versions

* update test cases

* fix lint issue

.github/workflows/test-python.yml

@@ -245,6 +245,39 @@ jobs:
       - name: Run simple code
         run: python -c 'import math; print(math.factorial(5))'
 
+  setup-versions-from-tool-versions-file:
+    name: Setup ${{ matrix.python }} ${{ matrix.os }} .tool-versions file
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          [
+            macos-latest,
+            windows-latest,
+            ubuntu-20.04,
+            ubuntu-22.04,
+            macos-13,
+            ubuntu-latest
+          ]
+        python: [3.13.0, 3.14-dev, pypy3.11-7.3.18, graalpy-24.1.2]
+        exclude:
+          - os: windows-latest
+            python: graalpy-24.1.2
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: build-tool-versions-file ${{ matrix.python }}
+        run: |
+          echo "python ${{ matrix.python }}" > .tool-versions
+
+      - name: setup-python using .tool-versions ${{ matrix.python }}
+        id: setup-python-tool-versions
+        uses: ./
+        with:
+          python-version-file: .tool-versions
+
   setup-pre-release-version-from-manifest:
     name: Setup 3.14.0-alpha.1 ${{ matrix.os }}
     runs-on: ${{ matrix.os }}