Added CI timeout for MySQL action

- in the event MySQL does not start, we don't want to be waiting around
  forever
- 3 minutes is kinda arbitrary and in reality, still way too long, but
  it's better than infinity

Author: daniellockyer

.github/workflows/ci.yml

@@ -517,6 +517,7 @@ jobs:
 
       - uses: daniellockyer/mysql-action@main
         if: matrix.env.DB == 'mysql8'
+        timeout-minutes: 3
         with:
           authentication plugin: 'caching_sha2_password'
           mysql version: '8.0'
@@ -645,6 +646,7 @@ jobs:
 
       - uses: daniellockyer/mysql-action@main
         if: matrix.env.DB == 'mysql8'
+        timeout-minutes: 3
         with:
           authentication plugin: 'caching_sha2_password'
           mysql version: '8.0'