fix: add missing line for new crates in dockerfile

Author: yannham

tools/docker/Dockerfile.build

@@ -125,6 +125,7 @@ COPY "builder/Cargo.toml"  "builder/"
 COPY "datadog-ffe/Cargo.toml" "datadog-ffe/"
 COPY "datadog-ffe-ffi/Cargo.toml" "datadog-ffe-ffi/"
 COPY "libdd-otel-thread-ctx/Cargo.toml" "libdd-otel-thread-ctx/"
+COPY "libdd-otel-thread-ctx-ffi/Cargo.toml" "libdd-otel-thread-ctx-ffi/"
 RUN find -name "Cargo.toml" | sed -e s#Cargo.toml#src/lib.rs#g | xargs -n 1 sh -c 'mkdir -p $(dirname $1); touch $1; echo $1' create_stubs
 RUN echo \
     bin_tests/src/bin/crashtracker_bin_test.rs \