Added builds against PHP nightly on Travis

[morozov]

Q	A
Type	improvement
BC Break	no

1. Backported Locked the PHP_CodeSniffer version to 3.5 for better compatibility with PHP 7.4 #3754 in order to enable PHP_CodeSniffer on PHP 7.4.
2. Backported all CI updates between 3.0.x and master:

   $ git log --stat 3.0.x..master -- .appveyor .scrutinizer.yml .travis.yml tests/{appveyor,continuousphp,travis}
   
   commit f37a88ed99a342080650b969a4dbebea21ca6ab8 (origin/master)
   Merge: 3e735a819 706660115
   Author: Sergei Morozov <morozov@tut.by>
   Date:   Wed Jan 1 20:14:58 2020 -0800
   
       Merge branch '2.10'
   
   commit 51d5c87a971f5f90a0c72b1d53dfb07bfda6f725
   Author: Sergei Morozov <morozov@tut.by>
   Date:   Thu Dec 19 16:42:33 2019 -0800
   
       Switching Travis CI builds to Ubuntu Bionic Beaver
       
       According to the [documentation](https://docs.travis-ci.com/user/reference/trusty/#container-based-infrastructure), `sudo: false` is no longed needed since Trusty.
   
    .travis.yml | 9 ++++-----
    1 file changed, 4 insertions(+), 5 deletions(-)
   
   commit ff45edaefabbb802671405d9ad91dfa84944cefd
   Author: Sergei Morozov <morozov@tut.by>
   Date:   Mon Apr 22 18:48:35 2019 -0700
   
       Switching Travis CI builds to Ubuntu Xenial Xerus
   
    .travis.yml                                   | 32 +++++++++----------
    tests/travis/create-mysql-schema.sql          |  3 ++
    tests/travis/install-mariadb.sh               | 13 ++++++++
    tests/travis/install-sqlsrv-dependencies.sh   |  2 +-
    tests/travis/mariadb.docker.travis.xml        | 45 +++++++++++++++++++++++++++
    tests/travis/mariadb.mysqli.docker.travis.xml | 45 +++++++++++++++++++++++++++
    tests/travis/mariadb.mysqli.travis.xml        |  2 --
    7 files changed, 123 insertions(+), 19 deletions(-)
   
   commit 75cf1515ccfe00860cd3649926eea59d35cdc20d
   Author: Sergei Morozov <morozov@tut.by>
   Date:   Tue Dec 17 18:15:19 2019 -0800
   
       Test primarily against PHP 7.4 on Travis
   
    .travis.yml | 170 ++++++++++++++++++++++++++++++------------------------------
    1 file changed, 85 insertions(+), 85 deletions(-)
   
   commit 59728eb3501e888100b40daf9a67f4bf9188b400
   Author: Andrey Bolonin <andreybolonin@users.noreply.github.com>
   Date:   Mon Dec 16 09:34:01 2019 +0200
   
       Use PHP 7.4 instead of a snapshot on Travis
   
    .travis.yml | 16 ++++++++--------
    1 file changed, 8 insertions(+), 8 deletions(-)
   
   commit ed9eb002b0b8f8f725e31f1095aeb2997da0835b
   Merge: ab8889629 0a5790ba9
   Author: Sergei Morozov <morozov@tut.by>
   Date:   Mon Nov 25 13:09:51 2019 -0800
   
       Merge branch '2.10'
   
   commit 355d242f4cbc40f5d475c13a5bdbf85a44f35b89
   Author: Claudio Zizza <claudio@budgegeria.de>
   Date:   Thu Jun 13 23:11:19 2019 +0200
   
       Remove Postgres 9.3 and MariaDB 10.0 support
   
    .travis.yml | 19 +------------------
    1 file changed, 1 insertion(+), 18 deletions(-)
   
   commit f9b3e7908f548a96d4ec62a30c8cb9fed7f95c7f
   Author: Michael Moravec <me@majkl.me>
   Date:   Sat Aug 18 03:12:18 2018 +0200
   
       Enable PHPStan in tests
   
    tests/continuousphp/bootstrap.php | 2 ++
    1 file changed, 2 insertions(+)
   
   commit faefe46db39bb4c55f3c525443e1836a5413e70e
   Author: Michael Moravec <me@majkl.me>
   Date:   Fri Mar 16 18:30:16 2018 +0100
   
       Drop support for PostgreSQL <9.3
   
    .scrutinizer.yml | 2 +-
    .travis.yml      | 7 -------
    2 files changed, 1 insertion(+), 8 deletions(-)
   

3. Added a section for PHP nightly in the build matrix derived from 7.3 (as a non-primary build version, Travis CI tests on PHP 7.3 #3347 (comment)) with added --ignore-platform-reqs and allow_failures.

[greg0ire]

I'm no longer sure there is value in nightly builds, see @Slamdunk 's first commit in https://github.com/doctrine/DoctrineModule/pull/672/files for reasons

[morozov]

Nightly is no longer PHP 7.4, it's 8.0-dev (build log).

[Slamdunk]

Yeah, I know. What I mean is that for my experience it's not a real 8.0-dev, it's just a development version of PHP that can produce, or nor, any error without real consequences for what 8.0 version will be at release time. So why bothering?

[morozov]

What I mean is that for my experience it's not a real 8.0-dev, it's just a development version of PHP that can produce.

What is a real 8.0-dev and why isn't nightly a real one?

Here, the build log shows this very issue that needs to be fixed to address DBAL's compatibility with PHP 8 that necessitates the DBAL 3.0 release. And it got fixed by #3803.

So why bothering?

I want to make sure that the PHP maintainers are informed about the consequences of the breaking changes made to PHP. Some of them may be reverted based on the feedback (e.g. php/php-src@4a5e17f).

The otherwise is also true: if something new gets broken in PHP, I want to know if this needs to be addressed here.

This looks like a healthy relationship between the projects to me.

[Slamdunk]

What is a real 8.0-dev and why isn't nightly a real one?

A month before 7.4 release a lot of projects I follow started having failing builds on nighlty while having manual test passing on a 7.4 custom compilation: this drove Nikita to push to Travis a separate 7.4snapshot tag in order to distinguish between a pre-release build and the pure development branch of PHP.
In that month the nightly tag gave a lot of false feedback while adding zero value to the CI process.

The feedback loop (in both direction) you described is very good and welcome, but only where maintainers know what they are doing.

So, because it seems you are so, I'm happy doctrine/dbal can be a step forward having nightly builds, but I discourage using it in smaller or slow-pace projects/libraries.

[lcobucci]

Looking good, just think you missed one small detail. Good job 👍