build: install ca-certificates to ensure md requests go through

Dockerfile

@@ -13,7 +13,7 @@ RUN touch src/main.rs
 RUN cargo build --release
 
 FROM debian:bookworm-slim AS run
-RUN apt update && apt install -y libssl3
+RUN apt update && apt install -y libssl3 ca-certificates
 WORKDIR /app
 COPY --from=build /app/target/release/mikisayaka .
 CMD [ "/app/mikisayaka" ]