Move test builds to separate directory

This prevents the test build from conflicting with the production build
in later jobs.

.circleci/config.yml

@@ -135,10 +135,13 @@ jobs:
       - run:
           name: Build extension for testing
           command: yarn build:test
+      - run:
+          name: Move test build to 'dist-test' to avoid conflict with production build
+          command: mv ./dist ./dist-test
       - persist_to_workspace:
           root: .
           paths:
-            - dist
+            - dist-test
 
   prep-docs:
     docker:
@@ -203,6 +206,9 @@ jobs:
       - checkout
       - attach_workspace:
           at: .
+      - run:
+          name: Move test build to dist
+          command: mv ./dist-test ./dist
       - run:
           name: test:e2e:chrome
           command: yarn test:e2e:chrome
@@ -221,6 +227,9 @@ jobs:
           command: ./.circleci/scripts/firefox-install
       - attach_workspace:
           at: .
+      - run:
+          name: Move test build to dist
+          command: mv ./dist-test ./dist
       - run:
           name: test:e2e:firefox
           command: yarn test:e2e:firefox