fix: action still runs if setup-python is not called (#542)

* fix: action works if setup-python is missed

* fix: two steps

* fix: combine again

* fix: use pipx for action

action.yml

@@ -19,8 +19,10 @@ runs:
 
     # This needs powershell-core because github.action path is a Windows-style
     # path on Windows.  Powershell-core understands both types of paths.
-    - run: python -m pip install ${{ github.action_path }}
+    - run: >
+        pipx run
+        --spec ${{ github.action_path }}
+        cibuildwheel
+        ${{ inputs.package-dir }}
+        --output-dir ${{ inputs.output-dir }}
       shell: pwsh
-
-    - run: python -m cibuildwheel ${{ inputs.package-dir }} --output-dir ${{ inputs.output-dir }}
-      shell: bash

docs/faq.md

@@ -116,7 +116,7 @@ If you use GitHub Actions for builds, you can use cibuildwheel as an action:
 uses: joerick/cibuildwheel@v1.7.4
 ```
 
-This is a composite step that just installs and runs cibuildwheel. You can set command-line options as `with:` parameters, and use `env:` as normal.
+This is a composite step that just runs cibuildwheel using pipx. You can set command-line options as `with:` parameters, and use `env:` as normal.
 
 Then, your `dependabot.yml` file could look like this: