Try to use mariadb in unittest again

The last time we tried this we had to revert due to flaky testing that
resulted. Now that we're aware mariadb vs mysql dialects may be
impactful we try again explicitly using the mariadb dialect in testing.

We switch zuul-nox and children over to debian-bookworm instead of
ubuntu-jammy so that we get python 3.11 and mariadb 10.11 on the host.
ubuntu-jammy has mariadb 10.6 which may be the source of the per test
db schema problems.

I think before we land this we will want to do much rechecking in order
to determine if any flaky tests are due to database instability.
Previously the db issues seemed to be around test isolation iirc.

Change-Id: I2f85a07cae2e7ba6566806ec70dbc3ac36a77f10

.zuul.yaml

@@ -59,7 +59,7 @@
     description: |
       Zuul unit tests with ZooKeeper running
     parent: nox
-    nodeset: ubuntu-jammy
+    nodeset: debian-bookworm
     pre-run: playbooks/zuul-nox/pre.yaml
     post-run: playbooks/zuul-nox/post-system-logs.yaml
     vars:
@@ -79,7 +79,7 @@
 - job:
     name: zuul-nox-remote
     parent: nox
-    nodeset: ubuntu-jammy
+    nodeset: debian-bookworm
     timeout: 2700  # 45 minutes
     pre-run: playbooks/zuul-nox/pre.yaml
     post-run: playbooks/zuul-nox/post-system-logs.yaml

bindep.txt

@@ -1,9 +1,9 @@
 # This is a cross-platform list tracking distribution packages needed by tests;
 # see http://docs.openstack.org/infra/bindep/ for additional information.
 
-mysql-client [test !platform:rpm]
+mariadb-client [test !platform:rpm]
+mariadb-server [test]
 mysql [test platform:rpm]
-mysql-server [test]
 postgresql [test]
 openssl [test]
 musl-dev [compile test platform:apk]

tests/base.py

@@ -1723,7 +1723,7 @@ class MySQLSchemaFixture(fixtures.Fixture):
             if connected:
                 db.close()
 
-        self.dburi = 'mysql+pymysql://{name}:{passwd}@{host}:{port}/{name}'\
+        self.dburi = 'mariadb+pymysql://{name}:{passwd}@{host}:{port}/{name}'\
             .format(
                 name=self.name,
                 passwd=self.passwd,

tools/docker-compose.yaml

@@ -2,8 +2,9 @@ version: "3"
 
 services:
   mysql:
-    container_name: zuul-test-mysql
-    image: mysql:8.0
+    container_name: zuul-test-mariadb
+    # Roughly matches version in Ubuntu Noble
+    image: mariadb:10.11
     environment:
       - MYSQL_ROOT_PASSWORD=insecure_worker
     ports:

tools/test-setup-docker.sh

@@ -40,7 +40,7 @@ else
 fi
 
 
-MYSQL="${DOCKER} exec zuul-test-mysql mysql  -u root -pinsecure_worker"
+MYSQL="${DOCKER} exec zuul-test-mariadb mysql  -u root -pinsecure_worker"
 
 if [ "${COMPOSE}" == "docker-compose" ]; then
   ${ROOTCMD} docker-compose rm -sf