Create the user in Snowflake as follows:
CREATE USER IF NOT EXISTS GHA_WIF_USER
TYPE = SERVICE
WORKLOAD_IDENTITY = (
TYPE = OIDC,
ISSUER = 'https://token.actions.githubusercontent.com',
SUBJECT = 'repo:roryjbd/snowflake-wif-test:ref:refs/heads/main',
OIDC_AUDIENCE_LIST = ('snowflakecomputing.com')
);