Use Github Actions as CI

Signed-off-by: Thomas Scholtes <geigerzaehler@axiom.fm>

.github/workflows/main.yaml

@@ -0,0 +1,22 @@
+name: Check and test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - run: pip install poetry
+    - uses: actions/setup-python@v3
+      with:
+        python-version: 3.8
+        cache: poetry
+    - run: poetry install
+    - run: poetry run flake8
+    - run: poetry run pytest
+    - uses: coverallsapp/github-action@v2
+      if: ${{ github.event_name == 'pull_request' }}
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -1,7 +1,7 @@
 beets-alternatives
 ==================
 
-[![Build Status](https://travis-ci.org/geigerzaehler/beets-alternatives.svg?branch=master)](https://travis-ci.org/geigerzaehler/beets-alternatives)
+[![Check and test](https://github.com/geigerzaehler/beets-alternatives/actions/workflows/main.yaml/badge.svg)](https://github.com/geigerzaehler/beets-alternatives/actions/workflows/main.yaml)
 [![Coverage Status](https://coveralls.io/repos/github/geigerzaehler/beets-alternatives/badge.svg?branch=master)](https://coveralls.io/github/geigerzaehler/beets-alternatives?branch=master)
 
 You want to manage multiple versions of your audio files with beets?