CI, celery, compose setup, hackity hack hack

.drone.yml

@@ -1,10 +1,6 @@
 ---
 matrix:
   include:
-    - IMAGE: 3.6-stretch
-      TOXENV: py36
-    - IMAGE: 3.7-stretch
-      TOXENV: py37
     - IMAGE: 3.8-buster
       TOXENV: py38
     - IMAGE: 3.8-buster
@@ -15,14 +11,10 @@ matrix:
       TOXENV: format
     - IMAGE: 3.8-buster
       TOXENV: type
-    - IMAGE: 3.8-buster
-      TOXENV: docs
-    - IMAGE: 3.8-buster
-      TOXENV: metadata-release
 
 pipeline:
   build:
     image: python:${IMAGE}
     commands:
-      - pip install tox==3.14.6
+      - pip install tox
       - tox -e ${TOXENV}