Fix drone file

.drone.yml

@@ -2,14 +2,13 @@ pipeline:
   build:
     image: python:3
     commands:
-	  - sudo apt-get install -y curl python-tk
+      - sudo apt-get install -y curl python-tk docker-ce docker-ce-cli containerd.io
       - sudo pip install -U pip
       - sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
       - sudo chmod +x /usr/local/bin/docker-compose
       - docker-compose --version
       - pip install -r dev-requirements.txt
       - git clone https://github.com/tsileo/poussetaches.git && cd poussetaches && docker build . -t poussetaches:latest && cd -
-	 script:
       - mypy --ignore-missing-imports .
       - flake8 activitypub.py
       - cp -r tests/fixtures/me.yml config/me.yml