MDEV-31529: MariaDB docker pipeline is failing

s390x database initialization was slow (thanks @tianon).

We don't use it, so fake its existance so debian install scripts
don't consume the intensive part of the installation.

[1] docker-library/official-images#14923

Author: grooverdan

10.10/Dockerfile

@@ -107,6 +107,8 @@ RUN set -ex; \
 		echo "mariadb-server" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

10.11/Dockerfile

@@ -107,6 +107,8 @@ RUN set -ex; \
 		echo "mariadb-server" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

10.4/Dockerfile

@@ -109,6 +109,8 @@ RUN set -ex; \
 		echo "mariadb-server-$MARIADB_MAJOR" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

10.5/Dockerfile

@@ -109,6 +109,8 @@ RUN set -ex; \
 		echo "mariadb-server-$MARIADB_MAJOR" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

10.6/Dockerfile

@@ -109,6 +109,8 @@ RUN set -ex; \
 		echo "mariadb-server-$MARIADB_MAJOR" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

10.9/Dockerfile

@@ -107,6 +107,8 @@ RUN set -ex; \
 		echo "mariadb-server" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

11.0/Dockerfile

@@ -107,6 +107,8 @@ RUN set -ex; \
 		echo "mariadb-server" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

11.1/Dockerfile

@@ -107,6 +107,8 @@ RUN set -ex; \
 		echo "mariadb-server" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

11.2/Dockerfile

@@ -107,6 +107,8 @@ RUN set -ex; \
 		echo "mariadb-server" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \

Dockerfile.template

@@ -109,6 +109,8 @@ RUN set -ex; \
 		echo "mariadb-server-$MARIADB_MAJOR" mysql-server/root_password_again password 'unused'; \
 	} | debconf-set-selections; \
 	apt-get update; \
+# postinst script creates a datadir, so avoid creating it by faking its existance.
+	mkdir -p /var/lib/mysql/mysql ; touch /var/lib/mysql/mysql/user.frm ; \
 # mariadb-backup is installed at the same time so that `mysql-common` is only installed once from just mariadb repos
 	apt-get install -y --no-install-recommends mariadb-server="$MARIADB_VERSION" mariadb-backup socat \
 	; \