[CI] Update PR commentary messages (#890)

* thank users for their contribution
* let users know about the golangci-lint reviews
* notify users about artifacts on buildkite

.github/probot.js

@@ -8,8 +8,10 @@ on('pull_request.opened')
         context =>
             context.payload.pull_request.head.ref.slice(0, 11) !== 'dependabot/'
     )
-    .comment(`# Docker Container
-These changes are published for testing at the following location:
+    .comment(`# Artifacts
+These changes are published for testing on Buildkite and DockerHub.
+
+## Docker Container
 * \`docker pull authelia/authelia:{{ pull_request.head.ref }}\``)
 
 // PR commentary for third party based contributions
@@ -18,6 +20,11 @@ on('pull_request.opened')
         context =>
             context.payload.pull_request.head.label.slice(0, 9) !== 'authelia:'
     )
-    .comment(`# Docker Container
-These changes once approved by a team member will be published for testing at the following location:
+    .comment(`Thanks for choosing to contribute. We lint all PR's with golangci-lint, autheliabot may add a review to your PR with some suggestions.
+You are free to apply the changes if you're comfortable, alternatively you are welcome to ask a team member for advice.
+
+# Artifacts
+These changes once approved by a team member will be published for testing on Buildkite and DockerHub.
+
+## Docker Container
 * \`docker pull authelia/authelia:PR{{ pull_request.number }}\``)