docker: Add vls remote_hsmd_socket binary

This Dockerfile builds the VLS binaries during the builder stage and copy only the `remote_hsmd_socket` binary into the final image.

Changelog-Added: Included VLS's remote_hsmd_socket binary with the Core Lightning image.

Author: ShahanaFarooqui

Dockerfile

@@ -163,6 +163,32 @@ RUN find /tmp/lightning_install -type f -executable -exec \
     awk -F: '/ELF/ {print $1}' | \
     xargs -r ${STRIP} --strip-unneeded
 
+# Build VLS remote_hsmd_socket
+WORKDIR /opt
+ARG VLS_VERSION=v0.14.0
+
+RUN git clone --depth 1 --branch ${VLS_VERSION} https://gitlab.com/lightning-signer/validating-lightning-signer.git
+
+WORKDIR /opt/validating-lightning-signer
+RUN mkdir -p .cargo && tee .cargo/config.toml <<EOF
+
+[build]
+target = "${target_arch_rust}"
+rustflags = ["-C", "target-cpu=generic"]
+
+[target.${target_arch_rust}]
+linker = "${CC}"
+
+EOF
+
+RUN cargo build --release
+
+RUN cp -r ./target/${target_arch_rust}/release/ /tmp/vls_install/ \
+    && find /tmp/vls_install -type f -executable -exec \
+    file {} + | \
+    awk -F: '/ELF/ {print $1}' | \
+    xargs -r ${STRIP} --strip-unneeded
+
 FROM base-target AS final
 
 RUN apt-get update && \
@@ -176,8 +202,9 @@ RUN apt-get update && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-COPY --from=downloader    /opt/bitcoin/bin/bitcoin-cli      /usr/bin/
-COPY --from=builder       /tmp/lightning_install/           /usr/local/
+COPY --from=downloader    /opt/bitcoin/bin/bitcoin-cli          /usr/bin/
+COPY --from=builder       /tmp/lightning_install/               /usr/local/
+COPY --from=builder       /tmp/vls_install/remote_hsmd_socket   /var/lib/vls/bin/
 
 COPY tools/docker-entrypoint.sh    /entrypoint.sh