Don't build twice on CI and don't ignore the jest setup file

Author: jamesdaniels

.dockerignore

@@ -11,6 +11,7 @@ node_modules/
 
 .vscode/*
 reactfire/**/*.js
+!reactfire/jest.setup.js
 !reactfire/babel.config.js
 !reactfire/rollup.config.js
 

.travis.yml

@@ -47,5 +47,4 @@ install:
 
 script:
   - cd reactfire
-  - yarn build
   - yarn test

Dockerfile

@@ -24,7 +24,6 @@ RUN yarn install --frozen-lockfile
 
 COPY . /
 
-RUN cd reactfire && yarn build
 RUN cd reactfire && yarn test
 
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