Update action workflow

- Python would be installed earlier than any other steps.
- It would give flexibility to specify the python version, which is not available on runner machine ( Fixes #4 )

action.yml

@@ -50,7 +50,17 @@ runs:
   using: 'composite'
   steps:
 
-    - name: checks
+    - name: (Install) python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ inputs.python_ver }}
+        architecture: ${{ inputs.python_arch }}
+
+    - name: (Install) python dev tools
+      shell: bash
+      run: python -m pip install pip wheel setuptools
+
+    - name: checks for inputs
       shell: bash
       run: python "${{ github.action_path }}/src/checks.py"
       env:
@@ -65,18 +75,8 @@ runs:
         spec: ${{ inputs.spec }}
         options: ${{ inputs.options }}
 
-    - name: Checkout
+    - name: Checkout repository
       uses: actions/checkout@v3
-
-    - name: (Install) python
-      uses: actions/setup-python@v4
-      with:
-        python-version: ${{ inputs.python_ver }}
-        architecture: ${{ inputs.python_arch }}
-
-    - name: (Install) python dev tools
-      shell: bash
-      run: python -m pip install pip wheel setuptools
 
     - name: (Install) dependencies
       if: inputs.requirements != ''