Add automatic deployment and a master link. (#265)

* ci: Add continuous deployment workflow for Mattermost plugin

* ci: Enable deployment workflow on test-deploy branch for testing

* feat: Support multiple tokens for Mattermost server deployments

* feat: Add force flag for plugin deployment in CI and Makefile

* unessisary

* setup to test

* feat: Add latest-master release creation and download badge

* Enable test branch

* Remove test branch

* no need for commit message

Bumping mattermost-plugin-ai to Major version 1.0.0

Bumping mattermost-plugin-ai to Patch version 0.9.3

Bumping mattermost-plugin-ai to Patch version 0.9.2

Bumping mattermost-plugin-ai to Patch version 0.9.1

Bumping mattermost-plugin-ai to Minor version 0.9.0

Release v0.8.1

Remove file dropdown button (#185)