Add CI pipeline to run unit tests

.dockerignore

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+# Node.js dependencies
+node_modules
+example

.drone.yml

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+kind: pipeline
+name: default
+
+steps:
+    - name: run tests
+      image: docker
+      commands:
+          - docker build -t test -f Dockerfile-test .
+          - docker run test
+      volumes:
+          - name: docker
+            path: /var/run/docker.sock
+      when:
+        branch:
+            - master
+        event:
+            - pull_request
+volumes:
+    - name: docker
+      host:
+          path: /var/run/docker.sock
+    - name: frontend-dep
+      host:
+          path: /drone/fluent/frontend-dep

Dockerfile-test

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+FROM node:12.11.1-alpine
+
+WORKDIR /web
+
+# Install tools
+RUN apk add --no-cache git
+RUN apk add --no-cache bash
+
+# Install dependencies
+COPY package.json yarn.lock ./
+RUN yarn
+
+COPY . .
+
+ENV CI=true
+
+CMD ["yarn", "test:unit", "--passWithNoTests"]