ci: Update dist-powerpc64le-linux to ubuntu:22.04

Author: cuviper

src/ci/docker/host-x86_64/dist-powerpc64le-linux/Dockerfile

@@ -1,22 +1,16 @@
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 COPY scripts/cross-apt-packages.sh /scripts/
 RUN sh /scripts/cross-apt-packages.sh
 
 COPY scripts/rustbuild-setup.sh /scripts/
 RUN sh /scripts/rustbuild-setup.sh
-USER rustbuild
 WORKDIR /tmp
 
-USER root
-
 RUN apt-get install -y --no-install-recommends rpm2cpio cpio
 COPY host-x86_64/dist-powerpc64le-linux/shared.sh host-x86_64/dist-powerpc64le-linux/build-powerpc64le-toolchain.sh /tmp/
 RUN ./build-powerpc64le-toolchain.sh
 
-COPY scripts/cmake.sh /scripts/
-RUN /scripts/cmake.sh
-
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh