build: manually install mold on alpine, as packaged version is broken

.docker/Dockerfile.alpine

@@ -81,6 +81,8 @@ RUN pip3 install --break-system-packages --root-user-action ignore mistletoe
 RUN git config --global --add safe.directory /workspace
 COPY install-static-libs.sh /usr/local/bin/install-static-libs.sh
 RUN bash /usr/local/bin/install-static-libs.sh gcc clang-19 :alpine
+COPY install-mold.sh /usr/local/bin/install-mold.sh
+RUN bash /usr/local/bin/install-mold.sh
 RUN adduser -G users -s bash -u 1000 -D mhx
 RUN apk add --no-cache xxhash-dev
 USER mhx

.docker/install-mold.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -ex
+
+cd "$HOME"
+mkdir pkgs
+cd pkgs
+
+MOLD_VERSION=2.37.1
+
+wget -O mold-${MOLD_VERSION}.tar.gz https://github.com/rui314/mold/archive/refs/tags/v${MOLD_VERSION}.tar.gz
+tar xf mold-${MOLD_VERSION}.tar.gz
+cd mold-${MOLD_VERSION}
+mkdir build
+cd build
+
+cmake .. -GNinja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local
+ninja
+ninja install
+
+cd "$HOME"
+rm -rf pkgs