Fix percona image tag

Author: cytopia

.github/workflows/build.yml

@@ -43,7 +43,7 @@ jobs:
           - 'percona  5.5'
           - 'percona  5.6'
           - 'percona  5.7'
-          - 'percona  5.8'
+          - 'percona  8.0'
     steps:
       # ------------------------------------------------------------
       # Setup repository

.github/workflows/nightly.yml

@@ -42,7 +42,7 @@ jobs:
           - 'percona  5.5'
           - 'percona  5.6'
           - 'percona  5.7'
-          - 'percona  5.8'
+          - 'percona  8.0'
         refs:
           - 'master'
           - '0.8'