Update Dockerfile to install Rust dependencies

Dockerfile

@@ -4,8 +4,9 @@ ARG VERSION
 FROM ghcr.io/openwrt/sdk:${SAFE_TARGET}-${VERSION}
 
 RUN ./scripts/feeds update packages && \
+    ./scripts/feeds install rust && \
     make defconfig && \
-    { make package/feeds/packages/rust/host-compile -j$(nproc) || \
-      make package/feeds/packages/rust/host-compile -j1 V=sc; } && \
+    { make package/rust/host/compile -j$(nproc) || \
+      make package/rust/host/compile -j1 V=sc; } && \
     rm -rf build_dir/host/rustc-*/rustc-*/build \
            dl/rustc-*.tar.*