Docker fix (#1039)

* Docker test

* Remove extra installs

* Don't run full test

* No need for testing dependencies

.github/workflows/test.yml

@@ -217,7 +217,6 @@ jobs:
   testdocker:
     name: Docker Test
     runs-on: ubuntu-latest
-    if: ${{ false }}
 
     steps:
     - name: Checkout Code

test/Dockerfile

@@ -1,4 +1,12 @@
 FROM ubuntu:20.04
-RUN apt-get update 
-RUN apt-get install -y python3-pip git
-RUN pip3 install git+https://github.com/geohot/tinygrad.git
+
+# Install python3.8, and pip3
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3.8 \
+    python3-pip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install python dependencies
+COPY . ./tinygrad
+WORKDIR tinygrad
+RUN pip install -e .