Remove PHP infra changes (moved to #6512)

The install_ddtrace.sh profiling fix and parametric Dockerfile
bookworm change are handled by #6512. This PR now only contains
the prepare-local-build.sh script.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bm1549

utils/build/docker/php/common/install_ddtrace.sh

@@ -41,9 +41,7 @@ fi
 
 EXTRA_ARGS=""
 PHP_VERSION=$(php -r "echo PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION;")
-# Only enable profiling if the package actually contains the profiling extension
-if [ "$(printf '%s\n' "7.1" "$PHP_VERSION" | sort -V | head -n1)" = "7.1" ] \
-   && [ -n "${PKG:-}" ] && tar tzf "$PKG" 2>/dev/null | grep -q profiling; then
+if [ "$(printf '%s\n' "7.1" "$PHP_VERSION" | sort -V | head -n1)" = "7.1" ]; then
   EXTRA_ARGS="--enable-profiling"
 fi
 

utils/build/docker/php/parametric/Dockerfile

@@ -1,5 +1,5 @@
 
-FROM datadog/dd-trace-ci:php-8.2_bookworm-6
+FROM datadog/dd-trace-ci:php-8.2_buster
 RUN switch-php nts
 WORKDIR /binaries
 ENV DD_TRACE_CLI_ENABLED=1