Try to get the mutants container user going

Author: sourcefrog

Dockerfile

@@ -3,8 +3,11 @@ 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 adduser --disabled-password --gecos "mutants-remote" mutants
+RUN adduser --disabled-password --gecos "mutants" mutants
 RUN --mount=type=bind,source=.,target=/src,rw cargo install --locked --path=/src --target-dir=/build
+USER mutants
+
+# TODO: Copy everything to a final image that doesn't need the build artifacts
 
 # FROM rust:latest AS final
 # COPY --from=build /build/release/cargo-mutants /usr/local/bin/