incorrect installation of dependencies

[j0nm1]

Describe the bug
When using a python-version that is not installed on the runner, the dependencies seem to get installed differently. This is a problem when using isort because it will scan all dependencies as well. When using 3.8.2 isort fails, with 3.8.3 it works fine.

Which version of the action are you using?

• v1
• v2
• Some other tag (such as v2.0.1 or master)

Environment

• self-hosted
• Linux
• Windows
• Mac

Python Versions
Only tested with 3.8.2

To Reproduce

name: Standard Pipeline

on:
  pull_request:
    branches: '**'

jobs:
  isort:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: actions/setup-python@v2
      with:
        python-version: 3.8.2

    - name: pip install
      run: pip install -r requirements.txt

    - name: isort
      run: isort --check .

Run/Repo Url
osbdr/pipeline-python-demo#16

Screenshots
With 3.8.2

With 3.8.3

[konradpabjan]

This should be resolved now. The root cause was #101 and #106

Version 3.8.3 was cached and pre-installed on our hosted runners while 3.8.2 had to be downloaded and installed. I tested with the v2 tag that was updated with the most recent fixes and isort passes. An older tag (v2.1.0) fails.