GHA: limit 'Deploy Doxygen documentation' to main repo only

that workflow was accidently triggered in fork repo, where
there's no github pages set

Signed-off-by: Ilia Shipitsin <[email protected]>
Acked-by: Frank Lichtenheld <[email protected]>
Message-Id: <[email protected]>
URL: https://www.mail-archive.com/[email protected]/msg32598.html
Signed-off-by: Gert Doering <[email protected]>

Author: chipitsine

.github/workflows/doxygen.yml

@@ -9,6 +9,7 @@ concurrency:
 jobs:
   build:
     runs-on: ubuntu-24.04
+    if: ${{ github.repository_owner == 'openvpn' || github.event_name == 'workflow_dispatch' }}
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with: