CI: use circleci

Travis cut to half the number of builds for open source projects,
this is slower builds. We are already paying for circleci.

.circleci/config.yml

@@ -0,0 +1,73 @@
+version: 2.1
+
+default: &default
+  steps:
+    - checkout
+    - run: git submodule sync
+    - run: git submodule update --init
+    - run: pip install --user tox
+    - run: scripts/circle/install_node.sh
+    - run:
+        name: Add node to the path
+        command: |
+          echo 'export PATH=~/.nvm/versions/node/v${NODE_VERSION}/bin:$PATH' >> $BASH_ENV
+          source $BASH_ENV
+    - run: tox
+
+jobs:
+  tests:
+    <<: *default
+    docker:
+      - image: 'cimg/python:3.6'
+        environment:
+          TOXENV: py36,codecov
+          TOX_POSARGS: ''
+      - image: 'docker.elastic.co/elasticsearch/elasticsearch:6.8.12'
+        name: search
+
+  lint:
+    <<: *default
+    docker:
+      - image: 'cimg/python:3.6'
+        environment:
+          TOXENV: lint
+
+  migrations:
+    <<: *default
+    docker:
+      - image: 'cimg/python:3.6'
+        environment:
+          TOXENV: migrations
+
+  docs:
+    <<: *default
+    docker:
+      - image: 'cimg/python:3.6'
+        environment:
+          TOXENV: docs
+
+  docs-lint:
+    <<: *default
+    docker:
+      - image: 'cimg/python:3.6'
+        environment:
+          TOXENV: docs-lint
+
+  eslint:
+    <<: *default
+    docker:
+      - image: 'cimg/python:3.6'
+        environment:
+          TOXENV: eslint
+          NODE_VERSION: 10.17.0
+
+workflows:
+  version: 2
+  test:
+    jobs:
+      - lint
+      - migrations
+      - docs
+      - docs-lint
+      - eslint
+      - tests

tox.ini

@@ -3,10 +3,6 @@ minversion=2.9.0
 envlist = py36,lint,docs
 skipsdist = True
 
-[travis]
-python =
-    3.6: py36, codecov
-
 [testenv]
 description = run test suite for the application with {basepython}
 setenv =