Add GitHub Actions workflow

.github/workflows/main.yml

+name: Run Python Tests
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - run: |
+          python -m pip install --upgrade pip
+          pip install .
+      - run: |
+          python setup.py test

.gitlab-ci.yml

-stages:
-    - evaluate
-
-run_evaluate:
-    image: ubuntu:18.04
-    stage: evaluate
-    variables:
-        trec_eval: 'yes'
-    script:
-        - apt update && apt install -y build-essential make git
-        - git clone https://github.com/usnistgov/trec_eval.git
-        - make -j -C trec_eval
-        - ./evaluate.sh
-    tags:
-        - mir