Added example for SFTP_v2 import

td_load/sftp_v2/README.md

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+# Workflow: td_load Example (SFTP_V2)
+
+This example workflow ingests data in daily basis, using [Treasure Data's Data Connector for SFTP V2](https://docs.treasuredata.com/articles/#!int/sftp_v2-server-import-integration/q/sftp_v2/qid/12261/qp/1) with [td_load](https://docs.digdag.io/operators/td_load.html) operator.
+
+The workflow also uses [Secrets](https://docs.treasuredata.com/articles/#!pd/setting-workflow-secrets-from-td-console/q/secret/qp/2) feature, so that you don't have to include your datasource credentials to your workflow files.
+
+# How to Run
+
+First, you can upload the workflow and trigger the session manually.
+
+    # Upload
+    $ td wf push td_load_example
+
+Second, please set SFTP credentials by `td wf secrets` command. We recommend you to use text file for setting secret_key_file. For more details, please see [digdag documentation](https://docs.digdag.io/command_reference.html#secrets)
+
+    # Set Secrets
+    $ td wf secrets --project td_load_example --set sftp.host
+    $ td wf secrets --project td_load_example --set sftp.port
+    $ td wf secrets --project td_load_example --set sftp.user
+    $ td wf secrets --project td_load_example --set sftp.secret_key_passphrase
+    $ td wf secrets --project td_load_example --set sftp.secret_key_file=@secret_key_file.txt
+
+    # Set Secrets on your local for testing
+    $ td wf secrets --local --set sftp.host
+    $ td wf secrets --local --set sftp.port
+    $ td wf secrets --local --set sftp.user
+    $ td wf secrets --local --set sftp.secret_key_passphrase
+    $ td wf secrets --local --set sftp.secret_key_file=@secret_key_file.txt
+
+Now you can reference these credentials by `${secret:}` syntax within yml file for `td_load` operator.
+
+- [config/daily_load.yml](config/daily_load.yml)
+
+Now, you can trigger the session manually.
+
+    # Run
+    $ td wf start td_load_example daily_load --session now
+
+# Required Keys
+
+| Keys     | Description |
+| -------- | ----------- |
+| host | Host name. |
+| port | Port number. |
+| user | User name. |
+| path_prefix | Prefix of output paths. |
+
+# Next Step
+
+If you have any questions, please contact support@treasure-data.com.

td_load/sftp_v2/config/daily_load.yml

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+in:
+  type: sftp_v2
+  host: ${secret:sftp.host}
+  port: ${secret:sftp.port}
+  auth_method: key_pair
+  #auth_method: password
+  user: ${secret:sftp.user}
+  secret_key_file: {"content": "${secret:sftp.secret_key_file}"}
+  secret_key_passphrase: ${secret:sftp.secret_key_passphrase}
+  user_directory_is_root: ${sftp.user_directory_is_root}
+  timeout: ${sftp.timeout}
+  path_prefix: "/path/file_${moment(session_time).format("YYYYMMDD")}.csv"
+  parser:
+    charset: UTF-8
+    newline: LF
+    type: csv
+    delimiter: ","
+    quote: "\""
+    escape: "\""
+    trim_if_not_quoted: false
+    skip_header_lines: 1
+    allow_extra_columns: false
+    allow_optional_columns: false
+    columns:
+    - {name: time, type: long}
+    - {name: id, type: long}
+    - {name: name, type: string}
+    - {name: category, type: string}
+out: {}

td_load/sftp_v2/daily_load.dig

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+timezone: UTC
+
+schedule:
+  daily>: 02:00:00
+
+sla:
+  time: 08:00
+  +notice:
+    mail>: {data: Treasure Workflow Notification}
+    subject: This workflow is taking long time to finish
+    to: [me@example.com]
+
+_export:
+  td:
+    dest_db: dest_db
+    dest_table: dest_table
+  sftp:
+    user_directory_is_root: false
+    timeout: 600
+
++prepare_table:
+  td_ddl>:
+  database: ${td.dest_db}
+  create_tables: ["${td.dest_table}"]
+
++load_step:
+  td_load>: config/daily_load.yml
+  database: ${td.dest_db}
+  table: ${td.dest_table}

td_load/sftp_v2/secret_key_file.txt

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+-----BEGIN RSA PRIVATE KEY-----
+Proc-Type: 4,ENCRYPTED
+DEK-Info: ABCDEFGHIJKLMNOPQRSTUVWXYZ
+
+AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
+CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
+DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
+EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
+ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
+-----END RSA PRIVATE KEY-----