Authenticate with environ

environ example provide code snippet for authenticate to YDB with environ variables

Authenticate produced with one of next environment variables:

• YDB_SERVICE_ACCOUNT_KEY_FILE_CREDENTIALS=<path/to/sa_key_file> — used service account key file by path
• YDB_ANONYMOUS_CREDENTIALS="1" — used for authenticate with anonymous access. Anonymous access needs for connect to testing YDB installation
• YDB_METADATA_CREDENTIALS="1" — used metadata service for authenticate to YDB from yandex cloud virtual machine or from yandex function
• YDB_ACCESS_TOKEN_CREDENTIALS=<access_token> — used for authenticate to YDB with short-life access token. For example, access token may be IAM token

Runing code snippet

export YDB_CONNECTION_STRING="grpcs://endpoint/?database=database"
export YDB_SERVICE_ACCOUNT_KEY_FILE_CREDENTIALS=/Users/user/.ydb/sa.jsoon 
environ
# or
export YDB_CONNECTION_STRING="grpcs://endpoint/?database=database"
export YDB_ANONYMOUS_CREDENTIALS="1" 
environ
# or
export YDB_CONNECTION_STRING="grpcs://endpoint/?database=database"
export YDB_METADATA_CREDENTIALS="1" 
environ
# or
export YDB_CONNECTION_STRING="grpcs://endpoint/?database=database"
export YDB_ACCESS_TOKEN_CREDENTIALS="YDB_ACCESS_TOKEN"
environ