Install mutants and nextest into container

Author: sourcefrog

Dockerfile

@@ -2,8 +2,8 @@
 FROM rust:latest AS build
 RUN apt update
 RUN apt install -y s3cmd tar zstd awscli clang build-essential
-# RUN cargo install --locked cargo-nextest
-# RUN --mount=type=bind,source=.,target=/src,rw cargo install --locked --path=/src --target-dir=/build
+RUN cargo install --locked cargo-nextest
+RUN --mount=type=bind,source=.,target=/src,rw cargo install --locked --path=/src --target-dir=/build
 
 # FROM rust:latest AS final
 # COPY --from=build /build/release/cargo-mutants /usr/local/bin/