fix 8.4 segfaults, test against PHP nightly

[brettmc]

• fix segfaults on 8.4, via zend_get_internal_function_extension_handle (see php/php-src@62ebe82)
• build against PHP nightly on PR and daily schedule
• use setup-php for linux builds (which drops Alpine builds)

Fixes: open-telemetry/opentelemetry-php#1376

[andypost]

FYI using this patch it shows failure on 32-bits like this

TEST 53/67 [tests/span_attribute/function_params_non_simple.phpt]
========DIFF========
--
       }
       ["three"]=>
       object(Closure)#2 (%d) {%A
013+     ["name"]=>
014+     string(148) "{closure:/builds/alpine/aports/testing/php84-pecl-opentelemetry/src/opentelemetry-1.1.0beta2/tests/span_attribute/function_params_non_simple.php:24}"
015+     ["file"]=>
016+     string(135) "/builds/alpine/aports/testing/php84-pecl-opentelemetry/src/opentelemetry-1.1.0beta2/tests/span_attribute/function_params_non_simple.php"
017+     ["line"]=>
018+     int(24)
       }
       ["four"]=>
       NULL
     }
     string(3) "foo"
018- string(4) "post"
024+ zend_mm_heap corrupted
========DONE========
FAIL Check if function non-simple types can be passed as function params [tests/span_attribute/function_params_non_simple.phpt] 

[brettmc]

FYI using this patch it shows failure on 32-bits like

Was able to replicate this using i386/alpine docker image...

[brettmc]

It should be green now against 32bit builds, @andypost
I'm open to any suggestions on how we could add 32bit builds to our pipeline, but I've added the capability to our local builds for now, so it's at least possible to be caught in future.

[andypost]

Thank you! It passed on all arches!

btw I noticed that CI here is not using latest stable Alpine version (3.20)