Fix minor issue

.devcontainer/Dockerfile

@@ -16,8 +16,8 @@ RUN apt-get install -y git procps
 # Remove outdated yarn from /opt and install via package 
 # so it can be easily updated via apt-get upgrade yarn
 RUN rm -rf /opt/yarn-* \
-    rm -f /usr/local/bin/yarn \
-    rm -f /usr/local/bin/yarnpkg \
+    && rm -f /usr/local/bin/yarn \
+    && rm -f /usr/local/bin/yarnpkg \
     && apt-get install -y curl apt-transport-https lsb-release \
     && curl -sS https://dl.yarnpkg.com/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/pubkey.gpg | apt-key add - 2>/dev/null \
     && echo "deb https://dl.yarnpkg.com/$(lsb_release -is | tr '[:upper:]' '[:lower:]')/ stable main" | tee /etc/apt/sources.list.d/yarn.list \