Enable jemalloc heap profiling with libunwind backtraces

Build libunwind 1.8.3 as a static library before jemalloc, then
configure jemalloc with --enable-prof --enable-prof-libunwind so the
static libjemalloc.a can dump heap profiles with accurate stack
traces.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd7pBDVxQENBX1CP2z6Lip

alpine3.24/Dockerfile

@@ -628,6 +628,25 @@ RUN curl --fail --location --output redis-plus-plus.tar.gz \
     && cmake --build build --parallel "$(nproc)" --target install \
     && rm -rf build src
 
+RUN curl --fail --location --output libunwind.tar.gz \
+        https://wangguofang.net/github.com/libunwind/libunwind/archive/v1.8.3.tar.gz \
+    && mkdir src \
+    && tar --extract --gzip --file=libunwind.tar.gz --directory=src --strip-components=1 \
+    && rm libunwind.tar.gz \
+    && cd src \
+    && autoreconf --install \
+    && CFLAGS=-fPIC ./configure --prefix=/usr/local \
+        --disable-shared \
+        --enable-static \
+        --disable-tests \
+        --disable-documentation \
+        --disable-minidebuginfo \
+        --disable-zlibdebuginfo \
+    && make --jobs="$(nproc)" \
+    && make install \
+    && cd .. \
+    && rm -rf src
+
 RUN curl --fail --location --output jemalloc.tar.gz \
         https://wangguofang.net/github.com/jemalloc/jemalloc/archive/5.3.1.tar.gz \
     && mkdir src \
@@ -639,6 +658,8 @@ RUN curl --fail --location --output jemalloc.tar.gz \
         --disable-doc \
         --disable-shared \
         --enable-static \
+        --enable-prof \
+        --enable-prof-libunwind \
     && make --jobs="$(nproc)" \
     && make install \
     && cd .. \