For sharing your smart home actions with other users, follow theses steps,
- Click the "3-dots" icon in the upper right corner of the console (https://console.actions.google.com/)
- Click Manage user access (this redirects you to the Google Cloud Platform IAM permissions page)
- Click ADD at the top of the page
- Enter the email address of the user you want to add
- Click Select a role and choose Project > Viewer
- Click SAVE
In order to add users to a project, you need to be an owner of the project and after you're done with the above steps then all the added users will be able to see the Actions on their Google console. Additionally the users that have shared access to your Action can test it on Assistant-enabled devices such as their smartphones. But, before they can test the smart home Action, the added users must set up for testing. In order to test that Action device testing must be enabled for that device and after doing that it should be linked to the correct Google account. Performing this setup allows users to test on Google Assistant surfaces and on the Google Home app, using the same account you used to sign in to the Actions console. Find out more about setting up testing at https://developers.google.com/assistant/smarthome/develop/testing?hl=en#setup