ci(CircleCI): Use docker authenticated pulls (LLC-551) (#328)

Author: wobrien

.circleci/config.yml

@@ -1,4 +1,4 @@
-version: 2
+version: 2.1
 machine:
   services:
     - docker
@@ -7,7 +7,13 @@ jobs:
   build:
     docker:
       - image: node:8.17.0@sha256:ee25271e00572cb09d095f6b35880a284eac570c17452644bc67fd1d8dc7f9f7
+        auth:
+          username: $DOCKERHUB_USERNAME
+          password: $DOCKERHUB_PASSWORD
       - image: mongo:3.7.9@sha256:fbc5b316430a970543d2e1668164c764977e777a74ffb05c873d0e5df499b6fb
+        auth:
+          username: $DOCKERHUB_USERNAME
+          password: $DOCKERHUB_PASSWORD
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
       - WINSTON_CONSOLE_LEVEL: none
@@ -39,3 +45,10 @@ jobs:
       - deploy:
           name: Semantic Release
           command: npm run semantic-release
+
+workflows:
+  build:
+    jobs:
+      - build:
+          context:
+            - docker-hub-creds