ci: switch to on-prem ci (#637)

* ci: switch to on-prem ci

* ci: bump flavor size for keycloak tests
diff --git a/.github/workflows/keycloak.yml b/.github/workflows/keycloak.yml
index 86dad2e..676cf8e 100644
--- a/.github/workflows/keycloak.yml
+++ b/.github/workflows/keycloak.yml
@@ -22,7 +22,7 @@
 
 jobs:
   molecule:
-    runs-on: ubuntu-latest-4-cores
+    runs-on: v3-standard-8
     steps:
       - name: Checkout project
         uses: actions/checkout@v4