Updated env and config for analysis Flutter SDKs (#7970)

Author: isoos

Dockerfile.worker

@@ -7,6 +7,7 @@ RUN apt-get update && \
 
 ENV PUB_ENVIRONMENT="bot.pub_dev.pub_worker"
 ENV CI="true"
+ENV NO_COLOR="true"
 
 # Configure a 'worker' user, to avoid running processes as root when this is not
 # necessary (this is just docker hardening).

tool/setup-flutter.sh

@@ -44,5 +44,5 @@ fi
 # which should be already included in the tar archive. However, the tar archive requires
 # to run `flutter doctor` to work properly.
 cd "$1"
-./bin/flutter --no-version-check config --no-analytics
+./bin/flutter --no-version-check config --no-analytics --no-cli-animations
 ./bin/flutter --no-version-check doctor