Minor bugfixes + proper usage of constants

Ported from canonical/mysql-operator#304

* Preemptively switchover primary on scale-down

* addressing pr comments

…@% (#295)

* Update mysql image to 8.0.34 rock

* Update the rock hash in the upgrade test

* Deploy the latest/stable charm of the tls-operator in the tls integration test

* Update comment to correct version of mysql

…for 8.0.34 (#299)

* Update upgrade dependencies for mysqld and charm to account for 8.0.34

* Revert charm version to v1 in upgrade dependencies

* lib update

* render config file in the lib

* test fix

* refactor to use lib's new method for check connection

* won't check port before initializing users

* TDD for rollbacks

* split upgrade from stable

* trust

* set app data

* not doing upgrade from stable

* bump libjuju for nested assumes in metadata

* test fixes

* get first upgrading unit to check status
* use alternative name for mysql-test-app to avoid confusion with mysql app

* remove dup

* preemptively switchover on completion

* add missing resume

* split to reduce complexity and new mock

* bump lib

* pr feedback

* pr feedback plus more robust test to survice CI

* leader unit will stay in recovery state on rollback

* bump pytest_operator_cache

* fix build_charm fixture return as pathlib.Path

* fix rollback instruction

* address pr comments

* bump upgrade lib

* fix unit test

* more verbosity

* includes upgrade from stable

stable was bumped to version with upgrade support

* fix for rollback (data-platform-libs issue #97)

* extract and use helper function

* unneeded/wrong asserts

* fix fixture

* simplify fixture usage

* another fix

* fix call

* fix fixture reference

* revert mistakenly commited files

* CI matrix + env.vars

* pyproject updates (libjuju version, pytest-mock, etc)

* tox.ini equipped with Juju version selection vars

* Juju3 compatible tests

* Fixtures that allow detection and 'switching' between Juju versions

* snap_microk8s instead of old microk8s user

…312)

* Implement log rotation of error, general and slowquery logs

* Fix failing unit tests

* Avoid modifying the charm container's pebble layer

* Address PR + failing unit test

* Address PR feedback + add integration tests for log rotation

* Re-add jinja2 to pyproject dependencies

* Address PR feedback

* Port in fix to disable binlogging for flush log queries + make self-healing tests more consistent

* Add scripts directory to all paths in the tox file

* data_platform_libs/data_interfaces.py v18 (Relation Secrets)

* NO direct Relation databag usagegit add src/relations/mysql_provider.py!

* Checking the correct usage of relation databag vs. secrets

* Versions kept up-to-date for the pipeline

)

* Tests are running on Juju2 by default

* Juju 3.1/stable + Juju3 as default

* Updating CONTRIBUTING doc

…initialized (#323)

* Prevent starting logrotate dispatcher or flush mysql logs until unit initialized

* Always setup logrotate files in ephemeral storage during mysql-pebble ready in case pod is killed

* first passing

* using reboot_from_complete_outage instead

Ported from canonical/mysql-operator#306

…rkflow