Allow PHP 7.2 to fail

Author: dfridrich

.github/workflows/test.yaml

@@ -10,17 +10,22 @@ on:
 jobs:
     run:
         runs-on: ubuntu-latest
+        continue-on-error: ${{ matrix.experimental }}
         strategy:
             fail-fast: false
             matrix:
                 php-versions:
-                    - 7.2
                     - 7.3
                     - 7.4
                     - 8.1
                     - 8.2
                     - 8.3
                     - 8.4
+                experimental: [false]
+                include:
+                    - php: '7.2'
+                      experimental: true
+
         name: PHP ${{ matrix.php-versions }} test
 
         steps: