vls: add healthcheck

- use rpc server info command
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

vlsd/Dockerfile

@@ -17,6 +17,7 @@ RUN git clone https://gitlab.com/lightning-signer/validating-lightning-signer.gi
 RUN cd vls && \
     git checkout $GIT_HASH && \
     cargo install --path ./vls-proxy --bin vlsd2 --profile release --root /usr/local/ && \
+    cargo install --path ./vls-cli --profile release --root /usr/local/ && \
     cargo clean
 
 FROM --platform=${TARGETPLATFORM:-${BUILDPLATFORM:-linux/amd64}} alpine:3.18 as runner
@@ -38,10 +39,14 @@ RUN apk update && \
   bind-tools
 
 COPY --from=builder /usr/local/bin/vlsd2 /usr/local/bin/vlsd2
+COPY --from=builder /usr/local/bin/vls-cli /usr/local/bin/vls-cli
 
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
+COPY healthcheck.sh /healthcheck.sh
+RUN chmod +x /healthcheck.sh
+
 COPY vlsd2.toml /vlsd2.toml
 
 ENV VLS_DATA=/home/vls/.lightning-signer
@@ -55,6 +60,9 @@ VOLUME ["${VLS_DATA}"]
 
 USER vls
 
+HEALTHCHECK --interval=10s --timeout=10s --start-period=10s \
+    CMD ["/bin/sh", "-c", "/healthcheck.sh"]
+
 ENTRYPOINT ["/entrypoint.sh"]
 
 RUN vlsd2 --git-desc

vlsd/healthcheck.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -ex
+
+vls-cli info