Merge pull request #544 from weecology/henrykironde-test_ci_pr_on_rep…

…o_or_main

Additionally run tests on main after merging PR [no version bump]

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Tests will fail on PRs from forks
-        if: github.event.pull_request.head.repo.full_name != github.repository
+        if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository
         run: |
           echo Tests require pull requests be submitted from branches in the main repository
           exit 1