Workbench: Install Yarn with corepack.

workbench/Dockerfile

@@ -242,6 +242,7 @@ RUN export PIP_CONSTRAINT=/tmp/constraint.txt && \
     pipx install chalice && \
     pipx install curator-opensearch && \
     rm -rf /tmp/* /var/tmp/* ~/.cache/*
+ENV COREPACK_HOME=/usr/local/share/corepack
 # hadolint ignore=DL3016
 RUN npm install --global \
         @bitwarden/cli \
@@ -249,6 +250,7 @@ RUN npm install --global \
         corepack \
     && \
     chown -R root:root /usr/local/lib/node_modules/@bitwarden/cli/node_modules/ && \
+    corepack install --global yarn && \
     rm -rf /tmp/* /var/tmp/* ~/.cache/*
 RUN export GOPATH=/usr/local/lib/go && \
     mkdir "$GOPATH" && \