Fixed alternative docker files (#4797)

dockerfiles/v3/alpine

@@ -37,7 +37,7 @@ RUN apk add --no-cache \
     && ( echo 'install: --no-document' ; echo 'update: --no-document' ) >>/etc/gemrc
 COPY . ./
 RUN bundle install -j4 \
-    && yarn install \
+    && yarn install
 
 ARG RAILS_ENV
 ENV RAILS_ENV=${RAILS_ENV:-production}

dockerfiles/v3/amazonlinux

@@ -35,7 +35,7 @@ RUN amazon-linux-extras list | grep ruby
 
 COPY . ./
 RUN bundle install -j4 \
-    && yarn install \
+    && yarn install
 
 ARG RAILS_ENV
 ENV RAILS_ENV=${RAILS_ENV:-production}