Github Actions don't reuse cache

Question

I have a pretty simple step for CI on Github Actions, which is supposed to cache Python dependencies, so it would save a lot of computing time.

  some-step:
    name: 'Test step'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - run: pipx install poetry
      - name: Set up Python 3.8
        uses: actions/setup-python@v4
        with:
          python-version: "3.8"
          architecture: "x64"
          cache: "poetry"
      - name: Install dependencies
        run: poetry install
      - run: poetry run ...

Every time when I create a new PR, new cache is generated, even if dependencies didn't change. As I found out it happens because of cache branch restrictions.

My question is how to create a common cache? Or how to remove branch restrictions?

I rarely have to rerun my actions, so this caching implementation doesn't give any benefits.

Answer 1

I reused action (it's really light and does a simple check quickly) and created a new workflow, which runs on lock file changes in master or could be run manually.

on:
  push:
    branches:
      - master
    paths:
      - 'poetry.lock'
  workflow_dispatch:
    inputs:
      logLevel:
        description: 'Log level'
        required: false
        default: 'warning'
        type: choice
        options:
          - info
          - warning
          - debug 
jobs:  
    some-step:
        name: 'Test step'
        runs-on: ubuntu-latest
        steps:
          - uses: actions/checkout@v3
          - run: pipx install poetry
          - name: Set up Python 3.8
            uses: actions/setup-python@v4
            with:
              python-version: "3.8"
              architecture: "x64"
              cache: "poetry"
          - name: Install dependencies
            run: poetry install
          - run: poetry run ...