ci: fix release ci for yarn 1.22.22

[chillcicada]

For yarn classic, "prepublish": "RELEASE=true yarn build" will only take effect on child process for yarn prepublish because here "RELEASE=true" is a shell variable instead of the environment variable. In yarn berry (2+, 3+, 4+), "RELEASE=true" will be promoted to environment variable. while the github ci (ubuntu-lastest) still use yarn classic, so the "prepublish": "RELEASE=true yarn build" will take no effect. There are many solutions:

• update yarn to berry in ci
• use cross-env to promote "RELEASE=true" to environment variable for yarn classic
• set "prepublish": "export RELEASE=true; yarn build" (but this does not work for Windows) or just define the "RELEASE=true" in ci (this commit)

This close #660