valgrind memcheck needs suppressions to pass

[gjcarrette]

Description

See https://valgrind.org/docs/manual/manual-core.html#manual-core.suppress

Need to modify the build and test workflow to include the setup of a valgrind suppression file.

Expected Behaviour

When running the dispatch_build_and_test action with valgrind memcheck there should be no leak failures and no mem files left in the test artifact directory.

Actual Behaviour

You see things like this:
==7343== Conditional jump or move depends on uninitialised value(s)
1==7343== at 0x3DA386: zend_string_equal_val (in /usr/bin/php7.4)`

Affected Version

All versions in the entire php version test matrix.

Steps to Reproduce

Run the dispatch_build_and_test with the valgrind options memcheck.

[github-actions]

Automatically marking issue as stale due to lack of activity