Additional features for the DevOps deployment specification file

The following new capabilities have been added to the deployment specification file that allow you to define how commands get executed for an instance group deployment: 1. Vault variables: The value for vault variables is retrieved from the vault secret and made available as environment variables for all the steps inside the deployment specification file. 2. Multiline command: Both single and multiple line commands are now supported. Multiline commands essentially work like a bash script. 3. On failure support: To gracefully exit the deployment stage, you can now specify a list of steps that must be run on failure. 4. Shell override at step level: The deployment spec allows the shell to be used at the deployment specification global level. This enhancement allows the value to be overridden at the ‘step’ level.