Run on ubuntu-18.04 to preserve PHP 7.3

tobyzerner · web-flow · commit 71d5114f0e6e · 2021-01-16T18:22:28.000+10:30
diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     
     strategy:
       matrix:
