Dockerfile in concourse-github-status-0.6.3 vs Dockerfile in concourse-github-status-0.6.4

@@ -1,9 +1,11 @@
 FROM colstrom/concourse-fuselage
 
 RUN apk-install git ca-certificates libressl-dev \
     && update-ca-certificates \
+    && apk update \
     && apk del openssl-dev \
+    && rm -vf /var/cache/apk/* \
     && gem-install concourse-github-status
 
 WORKDIR /opt/resource
 
 RUN find $(gem environment gemdirs) -type f -path '*/concourse-github-status-*/bin/*' -exec ln -s '{}' \;