Tests/docker (#1573)

* devel image

* try parallel

* new image

.github/CONTRIBUTING.md

@@ -129,7 +129,7 @@ Test your work locally to speed up your work since so you can focus only in part
  To setup a local development environment, install both local and test dependencies:
 ```bash
 pip install -r requirements.txt
-pip install -r tests/requirements.txt
+pip install -r tests/requirements-devel.txt
 ``` 
 
 You can run the full test-case in your terminal via this bash script: 

.github/workflows/ci-testing.yml

@@ -81,7 +81,7 @@ jobs:
       run: |
         # python -m pip install --upgrade --user pip
         pip install -r requirements.txt -U -f https://download.pytorch.org/whl/torch_stable.html -q
-        HOROVOD_BUILD_ARCH_FLAGS="-mfma" pip install -r ./tests/requirements.txt -q
+        HOROVOD_BUILD_ARCH_FLAGS="-mfma" pip install -r ./tests/requirements-devel.txt -q
         # pip install tox coverage
         python --version
         pip --version