Install modin from source on CI

Author: honno

.github/workflows/test.yml

@@ -1,7 +1,5 @@
 name: Run tests
-on:
-  - push
-  - pull_request
+on: [push, pull_request]
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -17,7 +15,8 @@ jobs:
         pip install -r requirements.txt
     - name: Install dataframe libraries
       run: |
-        pip install vaex modin[ray]
+        pip install ray git+https://github.com/modin-project/modin
+        pip install vaex  # use stable as no nightly builds and long build time
         pip install -i https://pypi.anaconda.org/scipy-wheels-nightly/simple pandas --ignore-installed --no-deps
     - name: Run tests
       run: |