Add TrustServerCertificate to SqlServerAdapter

[ingLomeland]

Fixes #2093

This PR adds TrustServerCertificate=true to the connection string. This is needed for sqlserver 2017 and 2019. Tested that phinx works with sqlsrv 2019 after this fix.

@markstory

[garas]

TrustServerCertificate=true skips the trust chain validation, so the application connects even if the certificate can't be verified. Using TrustServerCertificate=false enforces certificate validation and is a best practice.

It should be enabled through configuration. For this, it needs some new configuration key like dsn_options, might be useful for other adapters too.

[ingLomeland]

Hi, added it as a configuration option. Could you look at it again? @garas

[markstory]

Should we handle converting the boolean into a string? Having users define a string true is a bit counter-intuitive.

[MasterOdin]

I wonder if there's a way to generalize this so that we don't need to add handlers for all possible additional allowed options for SQLServer. We use the prefix sqlsrv_attr_ for detecting PDO settings, perhaps we can do a similar prefix for DSN specific settings, or have a key that expects to point at an associative array of settings? This way, we don't need to have this same if statement setup for a number of different options, and in this case, I think having them be whatever the user inputs makes sense (e.g. a string) as that's what the settings page calls for.

I would probably lean towards the array option (dsn_options?) as that seems more easily extendable to other adapters if we ever need it.

[ingLomeland]

Added dsn_options

[MasterOdin]

This test isn't overly valuable as it doesn't really test that the dsn_options were used in any way, but there's currently not a good way to do that. This method is also similar with how we test the effect of port missing as well:

phinx/tests/Phinx/Db/Adapter/SqlServerAdapterTest.php

Lines 62 to 68 in 48d8e1f

	public function testConnectionWithoutPort()
	{
	$options = $this->adapter->getOptions();
	unset($options['port']);
	$this->adapter->setOptions($options);
	$this->assertInstanceOf('PDO', $this->adapter->getConnection());
	}

so it's not like this is the only place we have this. I'd like to address this in a separate PR, so I'm fine with merging this for now as is.