ci: test both push and pull_request events

I think we have a bug with pull_request events so...

action.yml

@@ -90,6 +90,7 @@ runs:
       # We want to generate a comment and we we able to find the PR number
       if: inputs.comment-on-pr == 'true' && steps.pr-number.outputs.pr-number != ''
       env:
+        ARTIFACT_NAME: ${{ inputs.artifact-name }}
         PR_ID: ${{ steps.pr-number.outputs.pr-number }}
         COMMENT_ID: ${{ steps.find-comment.outputs.comment-id }}
         DO_COMPARISON: ${{ inputs.do-comparison }}

scripts/retrieve-old-report.sh

@@ -58,11 +58,10 @@ if [ "$(in_private_repo)" != 'true' ] && [ "$JOB_NAME" ]; then
   error "Failed to find previous report, expected at: $report_url"
 fi
 
-warn "Couldn't retrieve old report:"
-warn '    This usuially happens when running on private repos'
-warn '    or when job-name is not set.'
-warn
-warn '    See the README for more details'
+warn "Couldn't retrieve old report:
+  note: This usually happens when running on private repos or when job-name is not set.
+
+        See the README for more details"
 
 error "Falling back to slow method (checkout $base_branch and generate the report)"