feat: update docker from 18 to 20

includes/docker-build.yml

@@ -14,9 +14,10 @@
   }
 
 .docker-build-base:
-  image: docker:18-dind
+  image: docker:20
   services:
-    - docker:18-dind
+    - name: docker:20-dind
+      command: ["--tls=false"] # see https://gitlab.com/gitlab-org/gitlab-runner/-/issues/27300#note_466755332
   variables:
     DOCKER_DRIVER: overlay2