dev: add cargo binaries to PATH in Dockerfile (#1511)

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg"
height="34" align="absmiddle"
alt="Reviewable"/>](https://reviewable.io/reviews/kkrt-labs/kakarot/1511)
<!-- Reviewable:end -->

docker/deployer/Dockerfile

@@ -23,6 +23,8 @@ RUN --mount=type=cache,target=/root/.cache \
 RUN --mount=type=cache,target=/root/.cache \
 curl -LsSf https://astral.sh/uv/install.sh | sh
 
+ENV PATH="/root/.cargo/bin:$PATH"
+
 WORKDIR /app/kakarot
 
 ############################################