docker: add a trixie docker image, update node and emsdk

diff --git a/contrib/Dockerfile_bookworm b/contrib/Dockerfile_bookworm
index 417fce1..c3b186f 100644
--- a/contrib/Dockerfile_bookworm
+++ b/contrib/Dockerfile_bookworm
@@ -1,5 +1,5 @@
 #
-# Dockerfile for wally builds on Debian bookworm (stable).
+# Dockerfile for wally builds on Debian bookworm (oldstable).
 # build from this directory with e.g:
 #     docker buildx build --platform linux/arm64,linux/amd64 -f Dockerfile_bullseye -t greenaddress/wallycore:bookworm .
 #
diff --git a/contrib/Dockerfile_bullseye b/contrib/Dockerfile_bullseye
index 277292a..443ec30 100644
--- a/contrib/Dockerfile_bullseye
+++ b/contrib/Dockerfile_bullseye
@@ -1,5 +1,5 @@
 #
-# Dockerfile for wally builds on Debian bullseye (oldstable).
+# Dockerfile for wally builds on Debian bullseye (oldoldstable).
 # build from this directory with e.g:
 #     DOCKER_BUILDKIT=1 docker build . -t greenaddress/wallycore -f Dockerfile_bullseye
 # and for linux/arm64:
diff --git a/contrib/Dockerfile_trixie b/contrib/Dockerfile_trixie
new file mode 100644
index 0000000..436e7fc
--- /dev/null
+++ b/contrib/Dockerfile_trixie
@@ -0,0 +1,16 @@
+#
+# Dockerfile for wally builds on Debian trixie (stable).
+# build from this directory with e.g:
+#     DOCKER_BUILDKIT=1 docker build . -t blockstream/wallycore -f Dockerfile_trixie
+# and for linux/arm64:
+#     DOCKER_BUILDKIT=1 docker build . -t blockstream/wallycore -f Dockerfile_trixie --platform linux/arm64 --build-arg TARGETARCH=arm64
+#
+FROM debian:trixie@sha256:35b8ff74ead4880f22090b617372daff0ccae742eb5674455d542bef71ef1999
+WORKDIR /root
+COPY trixie_deps.sh ./deps.sh
+COPY requirements.txt ./contrib/requirements.txt
+ARG TARGETARCH=amd64
+ENV TARGETARCH=${TARGETARCH}
+ENV JAVA_HOME=/usr/lib/jvm/java-21-openjdk-${TARGETARCH}
+RUN ./deps.sh && rm ./deps.sh
+ENV ANDROID_NDK=/opt/android-ndk-r26b
diff --git a/contrib/trixie_deps.sh b/contrib/trixie_deps.sh
new file mode 100755
index 0000000..e2d6651
--- /dev/null
+++ b/contrib/trixie_deps.sh
@@ -0,0 +1,78 @@
+#! /usr/bin/env bash
+# Install required dependencies for building wally
+# Options:
+# -e : Don't install emsdk (used for JS builds)
+# -j : Don't install Java SDK (used for Java builds)
+# -n : Don't install Android NDK (used for Android builds)
+# -w : Don't install MinGW (used for Windows cross compiles)
+set -e
+
+skip_emsdk=
+skip_ndk=
+skip_java=
+skip_windows=
+while getopts enjw name
+do
+    case $name in
+    e)   skip_emsdk=1;;
+    n)   skip_ndk=1;;
+    j)   skip_java=1;;
+    w)   skip_windows=1;;
+    *)   echo "Invalid flag"; exit 1;;
+    esac
+done
+shift $(($OPTIND - 1))
+
+apt update -qq
+apt upgrade -yqq
+
+java_packages=
+if [ -z "$skip_java" ]; then
+    jdk_package="openjdk-21-jdk"
+    jdk_install_dir="java-21-openjdk-$TARGETARCH"
+    jre_package="openjdk-21-jre"
+fi
+windows_packages=
+if [ -z "$skip_windows" ]; then
+    windows_packages="g++-mingw-w64-x86-64"
+fi
+apt install --no-install-recommends unzip autoconf automake autotools-dev pkg-config build-essential libtool python3{,-dev,-pip,-virtualenv} python{,-dev}-is-python3 clang{,-format,-tidy} git swig curl cmake libssl-dev libtool-bin $jdk_package $jre_package $windows_packages valgrind jq -yqq
+
+# Note --break-system-packages to allow installing our requirements system-wide
+pip install valgrind-codequality gcovr -r contrib/requirements.txt --break-system-packages
+
+pushd /opt
+
+if [ -z "$skip_ndk" ]; then
+    curl -L -o ndk.zip https://dl.google.com/android/repository/android-ndk-r26b-linux.zip
+    echo "ad73c0370f0b0a87d1671ed2fd5a9ac9acfd1eb5c43a7fbfbd330f85d19dd632  ndk.zip" | shasum -a 256 -c
+    unzip ndk.zip
+    rm ndk.zip
+fi
+
+if [ -z "$skip_emsdk" ]; then
+    # Install node 24
+    curl -fsSL https://deb.nodesource.com/setup_24.x | bash -
+    apt install nodejs -yqq
+    # Install emsdk
+    git clone https://github.com/emscripten-core/emsdk
+    cd emsdk
+    EMSDK_VERSION=3.1.57
+    ./emsdk install ${EMSDK_VERSION}
+    ./emsdk activate ${EMSDK_VERSION}
+    # Force emsdk to use the installed node version instead of its own
+    sed -i "s/^NODE_JS = .*$/NODE_JS = 'node'/g" /opt/emsdk/.emscripten
+    # Make emsdk commands available
+    source ./emsdk_env.sh
+fi
+
+if [ -f /.dockerenv ]; then
+    # Installing dependencies into a docker image.
+    # Purge uneeded files to keep the image as small as possible.
+    apt remove --purge curl unzip -yqq
+    apt -yqq autoremove
+    apt -yqq clean
+    rm -rf /var/lib/apt/lists/* /var/cache/* /tmp/* /usr/share/locale/* /usr/share/man /usr/share/doc /lib/xtables/libip6* /root/.cache
+fi
+
+popd