Install yarn in tidy dockerfile

Author: yotamofek

src/ci/docker/host-x86_64/tidy/Dockerfile

@@ -28,8 +28,7 @@ COPY scripts/nodejs.sh /scripts/
 RUN sh /scripts/nodejs.sh /node
 ENV PATH="/node/bin:${PATH}"
 
-# Install eslint
-COPY host-x86_64/tidy/eslint.version /tmp/
+COPY host-x86_64/tidy/*.version /tmp/
 
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
@@ -40,7 +39,9 @@ RUN pip3 install --no-deps --no-cache-dir --require-hashes -r /tmp/reuse-require
 
 COPY host-x86_64/pr-check-1/validate-toolstate.sh /scripts/
 
-RUN bash -c 'npm install -g eslint@$(cat /tmp/eslint.version)'
+# Install yarn, and then use it to install eslint
+RUN bash -c 'npm install -g yarn@$(cat /tmp/yarn.version)'
+RUN bash -c 'yarn global add eslint@$(cat /tmp/eslint.version)'
 
 # NOTE: intentionally uses python2 for x.py so we can test it still works.
 # validate-toolstate only runs in our CI, so it's ok for it to only support python3.

src/ci/docker/host-x86_64/tidy/yarn.version

@@ -0,0 +1 @@
+1.22.22