@cosmetic add yarn to circleci image

.circleci/Dockerfile

@@ -11,3 +11,4 @@ RUN curl -O https://dl.google.com/go/go1.10.2.linux-amd64.tar.gz && tar xvf go*.
 ENV GOPATH=$HOME/work
 ENV PATH="${PATH}:/usr/local/go/bin:$GOPATH/bin"
 RUN go get github.com/aktau/github-release
+RUN npm install -g yarn

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 
 defaults: &defaults
   docker:
-    - image: gallileo/radarr-cci-primary:5.8.7
+    - image: gallileo/radarr-cci-primary:5.8.8
   environment:
       BUILD_VERSION: 0.2.0