ci: remove run condition for CI on push on main

(cherry picked from commit cc4d217547)

.gitea/workflows/ci.yml

@@ -2,9 +2,6 @@ name: Build'n check
 run-name: Performing Typst compilation
 on:
   push:
-  pull_request:
-    branches:
-      - main
 jobs:
   run-ci-linux:
     runs-on: ubuntu-latest
@@ -12,8 +9,7 @@ jobs:
     # push with commit containing "Run-Checks"
     if: >
       (contains(github.event.head_commit.message, 'Run-Checks') &&
-      github.event_name == 'push') ||
-      github.event_name == 'pull_request'
+      github.event_name == 'push')
     steps:
       - name: Check out repository code
         uses: actions/checkout@v3