Prepare upload to MariaDB 10.6.19 to Ubuntu 22.04 "Jammy"

Similar to !106 (merged), !85 (merged), !93 (merged), !69 (merged) and !59 (merged), this Merge Request contains the import of a new upstream version of MariaDB.

Do not review merge commits or upstream commits, but focus on the ones that are made only on the proposed ubuntu/22.04-jammy branch update in this MR:

git log --first-parent --reverse --format='format:* %C(yellow)%h%C(reset) %s' origin/ubuntu/22.04-jammy...

• 6794713d Update upstream source from tag 'upstream/10.6.19'
• 0cc22622 Update changelog and refresh patches after 10.6.19 import
• 259cbee8 Add NEWS item to explain new mariadb-dump option --sandbox
• bc96afe7 Add main.having_cond_pushdown to MTR skiplist on s390x
• e89abdaa Salsa CI: Add minimal Ubuntu pipeline for stable update regression testing
• 713dae49 Salsa CI: Also check that Lintian does not regress
• 69d555ef Update upstream source from tag 'upstream/10.6.21'
• 44550a67 Update changelog and refresh patches after 10.6.21 import
• 0aa37583 Add Lintian overrides for new issues that are not relevant for maintenance
• 3408c814 Make SysV init more verbose in case of MariaDB start failures
• 605d9b4c Apply "Limit check of running mysqld/mariadbd to system users (Closes: #1032047)"
• 5277457a When shutting down 'mariadbd', fallback to 'mysqld'
• d570f463 Make error more helpful in case server restart fails (Related: #1033234)
• b695ce81 MDEV-35907 debian-start script fails when using non-standard socket path
• e7ab4c03 Add some info on getting back to passwordless root (Closes: #1088133)
• 4d62d0fc Update changelog for 1:10.6.21-0ubuntu0.22.04.1 release

Changelog:

mariadb-10.6 (1:10.6.21-0ubuntu0.22.04.1) jammy-security; urgency=medium

[ Otto Kekäläinen ]
* SECURITY UPDATE: New upstream version 10.6.21 includes fixes for regressions
  as noted at https://mariadb.com/kb/en/mariadb-10-6-21-release-notes/ and
  also fixes the following security vulnerabilities (LP: #2099785):
  - CVE-2025-21490
* New upstream version 10.6.20. Includes fixes for several severe regressions
  as noted at https://mariadb.com/kb/en/mariadb-10-6-20-release-notes/
* New upstream version 10.6.19. Includes fixes for several severe regressions
  as noted at https://mariadb.com/kb/en/mariadb-10-6-19-release-notes/
* Include Debian packaging bugfixes done upstream:
  - MDEV-35907: debian-start script fails when using non-standard socket path
* Add main.having_cond_pushdown to MTR skiplist on s390x
* Include several restart/shutdown related fixes that have been in Debian
  unstable in MariaDB 11.4 for a long time, and which are likely needed to
  avoid occasional shutdown issues, in particular on upgrades (LP: #2011293)
  in both Debian and Ubuntu
  - Make SysV init more verbose in case of MariaDB start failures (Related: #1033234)
  - Limit check of running mysqld/mariadbd to system users (Related: #1032047)
  - When shutting down 'mariadbd', fallback to 'mysqld'
* Add Lintian overrides for new issues that are not relevant for maintenance
* Add NEWS item to explain new `mariadb-dump` option `--sandbox`

[ Phil Dibowitz ]
* Add some info on getting back to passwordless root (Related: #1088133)

 -- Otto Kekäläinen <otto@debian.org>  Sat, 22 Feb 2025 21:10:25 -0800

Test builds visible at https://launchpad.net/~mysql-ubuntu/+archive/ubuntu/mariadb/+builds?build_text=&build_state=all

Unfortunately riscv64 is failing on unclear reason:

[ 11%] Building CXX object mysys/CMakeFiles/mysys.dir/lf_hash.cc.o
cd /<<PKGBUILDDIR>>/builddir/mysys && /usr/bin/c++ -DHAVE_CONFIG_H -D_FILE_OFFSET_BITS=64 -I/<<PKGBUILDDIR>>/wsrep-lib/include -I/<<PKGBUILDDIR>>/wsrep-lib/wsrep-API/v26 -I/<<PKGBUILDDIR>>/builddir/include -I/<<PKGBUILDDIR>>/include -I/<<PKGBUILDDIR>>/mysys -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wdate-time -D_FORTIFY_SOURCE=2 -pie -fPIC -fstack-protector --param=ssp-buffer-size=4 -O3 -g -DNDEBUG -g -fno-omit-frame-pointer -fno-strict-aliasing -Wno-uninitialized -fno-omit-frame-pointer -D_FORTIFY_SOURCE=2 -DDBUG_OFF -Wall -Wenum-compare -Wenum-conversion -Wextra -Wformat-security -Wmissing-braces -Wno-format-truncation -Wno-init-self -Wno-nonnull-compare -Wno-unused-parameter -Wnon-virtual-dtor -Woverloaded-virtual -Wsuggest-override -Wvla -Wwrite-strings   -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -std=gnu++11 -MD -MT mysys/CMakeFiles/mysys.dir/lf_hash.cc.o -MF CMakeFiles/mysys.dir/lf_hash.cc.o.d -o CMakeFiles/mysys.dir/lf_hash.cc.o -c /<<PKGBUILDDIR>>/mysys/lf_hash.cc
In file included from /<<PKGBUILDDIR>>/mysys/lf_hash.cc:30:
/<<PKGBUILDDIR>>/include/my_cpu.h: In function ‘void MY_RELAX_CPU()’:
/<<PKGBUILDDIR>>/include/my_cpu.h:100:3: error: ‘__builtin_riscv_pause’ was not declared in this scope; did you mean ‘__builtin_riscv_fsflags’?
  100 |   __builtin_riscv_pause();
      |   ^~~~~~~~~~~~~~~~~~~~~
      |   __builtin_riscv_fsflags
make[4]: *** [mysys/CMakeFiles/mysys.dir/build.make:1395: mysys/CMakeFiles/mysys.dir/lf_hash.cc.o] Error 1