don't install cypress binary

Dockerfile

@@ -280,13 +280,15 @@ COPY --from=composer:2.6.5 /usr/bin/composer /usr/bin/composer
 # pass it to build command with --build-arg BUILD_ALL=0
 ARG BUILD_ALL=1
 # install php and js dependencies and build assets
+# avoid installing cypress
+ENV CYPRESS_INSTALL_BINARY=0
 # some ini settings are set on the command line to override the restrictive production ones already set
 # IMPORTANT: the yarn/build step must be done before the composer/install step because a source file (advancedQuery) will be generated by yarn
 # so in order for composer to take it into account, it must exist before we call the install command of composer.
 RUN if [ "$BUILD_ALL" = "1" ]; then corepack enable && yarn install \
     && yarn run buildall:prod \
     && /usr/bin/php81 -d memory_limit=256M -d open_basedir='' /usr/bin/composer install --prefer-dist --no-cache --no-progress --no-dev -a \
-    && yarn cache clean; fi
+    && yarn cache clean && rm -r /root/.cache /root/.yarn; fi
 # END ELABFTW
 
 # NGINX PART 2