Liphtier

the Alpine apk installation leaves all unneded bundled extension binaries in place: ``` du -had1 /opt/datadog-php/extensions/ 15.7M /opt/datadog-php/extensions/ddtrace-20180731-alpine.so 16.5M /opt/datadog-php/extensions/ddtrace-20230831.so 16.3M /opt/datadog-php/extensions/ddtrace-20180731.so 15.8M /opt/datadog-php/extensions/ddtrace-20230831-alpine.so 15.8M /opt/datadog-php/extensions/ddtrace-20220829-alpine.so 16.0M /opt/datadog-php/extensions/ddtrace-20180731-debug.so 1.6M /opt/datadog-php/extensions/ddtrace-20121113-debug.so...