Update yarn script for chakracore

Matched the behavior used for node-v8

Author: kfarnung

chakracore/8/Dockerfile

@@ -30,10 +30,10 @@ RUN set -ex \
   && curl -fSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz" \
   && curl -fSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz.asc" \
   && gpg --batch --verify yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz \
-  && mkdir -p /opt/yarn \
-  && tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/yarn --strip-components=1 \
-  && ln -s /opt/yarn/bin/yarn /usr/local/bin/yarn \
-  && ln -s /opt/yarn/bin/yarn /usr/local/bin/yarnpkg \
+  && mkdir -p /opt \
+  && tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/ \
+  && ln -s /opt/yarn-v$YARN_VERSION/bin/yarn /usr/local/bin/yarn \
+  && ln -s /opt/yarn-v$YARN_VERSION/bin/yarnpkg /usr/local/bin/yarnpkg \
   && rm yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz
 
 CMD [ "node" ]

chakracore/Dockerfile.template

@@ -30,10 +30,10 @@ RUN set -ex \
   && curl -fSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz" \
   && curl -fSLO --compressed "https://yarnpkg.com/downloads/$YARN_VERSION/yarn-v$YARN_VERSION.tar.gz.asc" \
   && gpg --batch --verify yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz \
-  && mkdir -p /opt/yarn \
-  && tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/yarn --strip-components=1 \
-  && ln -s /opt/yarn/bin/yarn /usr/local/bin/yarn \
-  && ln -s /opt/yarn/bin/yarn /usr/local/bin/yarnpkg \
+  && mkdir -p /opt \
+  && tar -xzf yarn-v$YARN_VERSION.tar.gz -C /opt/ \
+  && ln -s /opt/yarn-v$YARN_VERSION/bin/yarn /usr/local/bin/yarn \
+  && ln -s /opt/yarn-v$YARN_VERSION/bin/yarnpkg /usr/local/bin/yarnpkg \
   && rm yarn-v$YARN_VERSION.tar.gz.asc yarn-v$YARN_VERSION.tar.gz
 
 CMD [ "node" ]