ci: don't use target-cpu native (#718)

Author: andrewgazelka

.dockerignore

@@ -2,4 +2,5 @@
 Dockerfile
 .git/
 .gitignore
-.env
+.env
+.cargo/config.toml

Dockerfile

@@ -1,7 +1,6 @@
 # Define base arguments for versioning and optimization
 ARG RUST_NIGHTLY_VERSION=nightly-2024-11-29
-ARG RUST_TARGET_CPU=native
-ARG RUSTFLAGS="-C target-cpu=${RUST_TARGET_CPU} -Z share-generics=y -Z threads=8 --cfg tokio_unstable"
+ARG RUSTFLAGS="-Z share-generics=y -Z threads=8"
 ARG CARGO_HOME=/usr/local/cargo
 
 # Use Ubuntu as base image