Update Artikodin pull request trigger to pull_request_target (#5)

The `pull_request_target` trigger works in the context of the base branch, allowing to give access to secrets even in the context of forks, since this wouldn't run code from the pull request but code from the base branch.

This change will allow this workflow to run with secrets even if a pull request is made from a fork.

.github/workflows/artikodin.yaml

@@ -2,8 +2,11 @@ name: Artikodin pull-request handler
 
 
 on:
-  # Runs on a pull request for the main branch
-  pull_request:
+  # Runs on a pull request for the main branch (we use
+  # 'pull_request_target' instead of 'pull_request' so
+  # it also works for forks, since the secrets would
+  # otherwise not be available for forks.
+  pull_request_target:
     types:
       # Default events
       - opened