Update ci to include portable_atomic_no_outline_atomics

Author: BjornTheProgrammer

ci.sh

@@ -18,7 +18,7 @@ if ! command -v cargo-embassy-devtool &> /dev/null; then
     exit 1
 fi
 
-export RUSTFLAGS=-Dwarnings
+export RUSTFLAGS="-Dwarnings --cfg portable_atomic_unsafe_assume_single_core"
 export DEFMT_LOG=trace,embassy_hal_internal=debug,embassy_net_esp_hosted=debug,cyw43=info,cyw43_pio=info,smoltcp=info
 if [[ -z "${CARGO_TARGET_DIR}" ]]; then
     export CARGO_TARGET_DIR=target_ci

embassy-rp/CHANGELOG.md

@@ -18,7 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add reset_to_usb_boot for rp235x ([#4705](https://github.com/embassy-rs/embassy/pull/4705))
 - Add fix #4822 in PIO onewire. Change to disable the state machine before setting y register ([#4824](https://github.com/embassy-rs/embassy/pull/4824))
 - Add PIO::Ws2812 color order support
-- Remove unused deprecated atomic-polyfill crate from Cargo.toml ([#4909](https://github.com/embassy-rs/embassy/pull/4909))
+- Remove deprecated atomic-polyfill crate and use portable-atomic crate instead ([#4909](https://github.com/embassy-rs/embassy/pull/4909))
 
 ## 0.8.0 - 2025-08-26