ci: Run on MR

This also adds the new dependencies

.gitea/workflows/test.yml

@@ -1,6 +1,9 @@
 name: Gol CI
 
+# Run on the merge of a pull request to the main branch
 on:
+  pull_request:
+    branches: [main]
   push:
     branches: [main]
 
@@ -9,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Install cmake
+      - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y cmake
+          sudo apt-get install -y cmake libxrandr-dev
       - name: Build and test
         run: |
           mkdir build