chore(ci): add php nightly

Author: W0rma

.github/workflows/main.yml

@@ -5,10 +5,15 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
+    continue-on-error: ${{ matrix.experimental }}
 
     strategy:
       matrix:
         php: [8.1, 8.2, 8.3, 8.4, 8.5]
+        experimental: [false]
+        include:
+          - php: 8.6
+            experimental: true
 
     steps:
     - name: Checkout code