Add DNS testing setup using BIND 9 #18693
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This creates a test framework for testing PHP DNS functions that are currently completely untested. It provides script for starting BIND 9 DNS server that uses locally defined zone files. Those can be then used for creating specific test scenarios without a need to use online tests. As part of that, the systemd resolv script is provided to use BIND as a primary resolver. This all is then used in the CI.
The target branch is set to 8.3 because this is meant to be used for testing of fixes for the bug fixes.