Install libtool wherever PIE builds extensions

PIE warns about missing libtoolize/glibtoolize on every invocation,
cluttering the build logs of all variants: neither the Debian nor the
Alpine PHPIZE_DEPS include libtool. Add it to the builder dependencies
and to the dev stages' Xdebug install step in all three Dockerfiles.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Radiergummi

Dockerfile

@@ -59,6 +59,7 @@ RUN --mount=type=bind,from=pie,source=/pie,target=/usr/bin/pie \
       zlib1g-dev \
       libuv1-dev \
       libpq-dev \
+      libtool \
       git \
     ;
     # endregion
@@ -175,6 +176,15 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
     ln -sf "${PHP_INI_DIR}/php.ini-development" "${PHP_INI_DIR}/php.ini"
 
     # region Install XDebug
+    # libtool is required by PIE to build extensions
+    export DEBIAN_FRONTEND=noninteractive
+    apt-get update
+    apt-get install \
+        --yes \
+        --no-install-recommends \
+      libtool \
+    ;
+
     # TODO: Switch to stable when available
     if php --version | grep -q "PHP 8\.5"; then
       pie install xdebug/xdebug:@alpha

alpine.Dockerfile

@@ -48,6 +48,7 @@ RUN --mount=type=bind,from=pie,source=/pie,target=/usr/bin/pie \
       libuv-dev \
       curl-dev \
       pcre-dev \
+      libtool \
       icu-dev \
       git \
     ;
@@ -191,6 +192,7 @@ RUN --mount=type=bind,from=pie,source=/pie,target=/usr/bin/pie \
         --virtual .build-deps \
       ${PHPIZE_DEPS} \
       linux-headers \
+      libtool \
     ;
 
     # TODO: Switch to stable when available

frankenphp.Dockerfile

@@ -59,6 +59,7 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
       zlib1g-dev \
       libuv1-dev \
       libpq-dev \
+      libtool \
       git \
     ;
     # endregion
@@ -185,6 +186,15 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
     ln -sf "${PHP_INI_DIR}/php.ini-development" "${PHP_INI_DIR}/php.ini"
 
     # region Install XDebug
+    # libtool is required by PIE to build extensions
+    export DEBIAN_FRONTEND=noninteractive
+    apt-get update
+    apt-get install \
+        --yes \
+        --no-install-recommends \
+      libtool \
+    ;
+
     # TODO: Switch to stable when available
     if php --version | grep -q "PHP 8\.5"; then
       pie install xdebug/xdebug:@alpha