Set v7 as default for installation script

[flmmartins]

Describe what happened:
I am using the following script to install datadog: https://github.com/DataDog/datadog-agent/blob/main/cmd/agent/install_script.sh

I always like to run it and download the latest version of Datadog but I notice in the script the default is still set to V6 so I had to add the major version variable (DD_AGENT_MAJOR_VERSION ) to v7 to get the latest.

Describe what you expected:

I expected v7 to be default

Steps to reproduce the issue:

Run:

DD_API_KEY="${DATADOG_API_KEY}" DD_HOST_TAGS="${DATADOG_HOST_TAGS}" bash -c "$(curl -L https://raw.githubusercontent.com/DataDog/datadog-agent/master/cmd/agent/install_script.sh)"

Additional environment details (Operating System, Cloud provider, etc):

The behaviour happens in Ubuntu 20 and 18.

[mx-psi]

👋 Thanks for reporting this! We unfortunately can't do this on v1 of the install script for backwards compatibility reasons, but it's definitely on our list for a future v2.