fix(ci): Adjust npx package concurreny (UMAprotocol#4727)

Signed-off-by: Evaldo Felipe <[email protected]>

Author: evaldofelipe

Dockerfile

@@ -28,8 +28,11 @@ WORKDIR /across-relayer
 # Clode the relayer code and copy it to the across-relayer directory. Remove the package directory.
 RUN git clone https://github.com/across-protocol/relayer-v2.git .
 
+# This command fix a concurrency issue when the package was not found.
+RUN npx -y only-allow npm
+
 # Install depdencies.
-RUN npx -y only-allow npm && yarn install --frozen-lockfile && yarn build
+RUN yarn install --frozen-lockfile && yarn build
 
 # Set back the working directory to the protocol directory to default to that package.
 WORKDIR /protocol