Try to re-add automated tests to github actions (#17)

The recent fix to multiprocessing might or might not make tests run
properly here.

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: build
+on: [pull_request, push]
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+jobs:
+  build-all:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.8', '3.9', '3.10']
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+           docker build -f bin/all-py.Dockerfile \
+             --build-arg PYTHON_VERSION=${{ matrix.python-version }} \
+             --tag cogment_lab-all-docker .
+      - name: Run tests
+        run: docker run cogment_lab-all-docker pytest tests/*

bin/all-py.Dockerfile

@@ -33,7 +33,7 @@ RUN apt-get -y update \
 COPY . /usr/local/cogment_lab/
 WORKDIR /usr/local/cogment_lab/
 
-RUN pip install -r requirements.txt --no-cache-dir
+RUN pip install --upgrade pip
 RUN pip install .[all] --no-cache-dir
 
 ENV PATH="/usr/local/bin:${PATH}"

pyproject.toml

@@ -56,7 +56,7 @@ all = [
     "torch",
     "matplotlib",
     "wandb>=0.13.9",
-    "hatch>=1.9.1",
+    "hatch>=1.7.0",
     "ruff>=0.1.7",
     "jupyter>=1.0.0",
     "jupyterlab>=3.5.3",