image: don't use --allow-downgrade with stable rust
@@ -13,7 +13,7 @@ RUN ninja -C _build
RUN ninja -C _build install
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain none -y
-RUN $HOME/.cargo/bin/rustup install stable --profile minimal --allow-downgrade -c clippy -c rustfmt
+RUN $HOME/.cargo/bin/rustup install stable --profile minimal -c clippy -c rustfmt
RUN $HOME/.cargo/bin/rustup install beta --profile minimal --allow-downgrade -c clippy -c rustfmt
RUN $HOME/.cargo/bin/rustup install nightly --profile minimal --allow-downgrade -c clippy -c rustfmt
RUN $HOME/.cargo/bin/rustup install 1.56.0 --profile minimal --allow-downgrade -c clippy -c rustfmt
