Revert "fix: dockerfile add tokio_unstable env"

This reverts commit 5e32691.

Author: yiweichi

Dockerfile

@@ -13,7 +13,6 @@ RUN --mount=target=. \
 
 FROM chef AS builder
 WORKDIR /app
-ENV RUSTFLAGS="--cfg tokio_unstable"
 COPY --from=planner /recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json
 RUN --mount=target=. \
@@ -27,7 +26,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates
     rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
-ENV RUSTFLAGS="--cfg tokio_unstable"
+
 COPY --from=builder /app-target/release/rollup-node /bin/
 
 EXPOSE 30303 30303/udp 9001 8545 8546

Dockerfile.test

@@ -8,7 +8,7 @@ RUN cargo install cargo-chef --locked
 
 FROM chef AS planner
 WORKDIR /app
-ENV RUSTFLAGS="--cfg tokio_unstable"
+
 COPY . .
 # Hacky: Replace tests with dummy stub to avoid workspace member issues of top-level Cargo.toml.
 # This is needed because within the Docker integration tests we don't need the tests crate 
@@ -27,7 +27,6 @@ RUN cargo chef prepare --recipe-path /recipe.json
 
 FROM chef AS builder
 WORKDIR /app
-ENV RUSTFLAGS="--cfg tokio_unstable"
 COPY --from=planner /recipe.json recipe.json
 RUN --mount=type=cache,target=/usr/local/cargo/registry \
     --mount=type=cache,target=/usr/local/cargo/git \