test stage 1 library on CI

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/ci/docker/host-x86_64/i686-gnu-nopt/Dockerfile

@@ -27,5 +27,5 @@ RUN echo "[rust]" > /config/nopt-std-config.toml
 RUN echo "optimize = false" >> /config/nopt-std-config.toml
 
 ENV RUST_CONFIGURE_ARGS --build=i686-unknown-linux-gnu --disable-optimize-tests
-ENV SCRIPT python3 ../x.py test --stage 0 --config /config/nopt-std-config.toml library/std \
+ENV SCRIPT python3 ../x.py test --keep-stage 0 --stage 1 --config /config/nopt-std-config.toml library/std \
   && python3 ../x.py --stage 2 test

src/ci/docker/host-x86_64/mingw-check/Dockerfile

@@ -49,7 +49,7 @@ ENV SCRIPT python3 ../x.py --stage 2 test src/tools/expand-yaml-anchors && \
            python3 ../x.py clippy --stage 0 -Awarnings && \
            python3 ../x.py build --stage 0 src/tools/build-manifest && \
            python3 ../x.py test --stage 0 src/tools/compiletest && \
-           python3 ../x.py test --stage 0 core alloc std test proc_macro && \
+           python3 ../x.py test --keep-stage 0 --stage 1 core alloc std test proc_macro && \
            # Build both public and internal documentation.
            RUSTDOCFLAGS=\"--document-private-items --document-hidden-items\" python3 ../x.py doc --stage 0 library && \
            mkdir -p /checkout/obj/staging/doc && \

src/ci/docker/host-x86_64/x86_64-gnu-nopt/Dockerfile

@@ -29,5 +29,5 @@ RUN echo "optimize = false" >> /config/nopt-std-config.toml
 ENV RUST_CONFIGURE_ARGS --build=x86_64-unknown-linux-gnu \
   --disable-optimize-tests \
   --set rust.test-compare-mode
-ENV SCRIPT python3 ../x.py test --stage 0 --config /config/nopt-std-config.toml library/std \
+ENV SCRIPT python3 ../x.py test --keep-stage 0 --stage 1 --config /config/nopt-std-config.toml library/std \
   && python3 ../x.py --stage 2 test