Switch to GitHub runners; temporarily disable CPLEX

.github/workflows/main.yml

@@ -1,18 +0,0 @@
-name: Test
-on: push
-jobs:
-  build:
-    runs-on: self-hosted
-    steps:
-    - uses: actions/checkout@v1
-    - name: Run tests
-      run: |
-        rm -rf ~/.conda/envs/miplearn-test
-        yes | conda create --name miplearn-test python=3.6
-        (cd /opt/gurobi900/linux64 && ~/.conda/envs/miplearn-test/bin/python setup.py install)
-        (cd /opt/cplex-12.8/cplex/python/3.6/x86-64_linux && ~/.conda/envs/miplearn-test/bin/python setup.py install)
-        make install test \
-                PYTHON=~/.conda/envs/miplearn-test/bin/python \
-                PIP=~/.conda/envs/miplearn-test/bin/pip3 \
-                PYTEST=~/.conda/envs/miplearn-test/bin/pytest
-

.github/workflows/test.yml

@@ -0,0 +1,27 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+    - name: Check out source code
+      uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -i https://pypi.gurobi.com gurobipy
+        pip install -r requirements.txt
+
+    - name: Test with pytest
+      run: |
+        pytest