Update Dockerfile

Author: Yuki-cpp

Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:22.04 AS base
 RUN apt-get update
-RUN apt-get -y install wget build-essential cmake git software-properties-common curl zip unzip tar pkg-config python
+RUN apt-get -y install wget build-essential cmake git software-properties-common curl zip unzip tar pkg-config python3
 
 FROM base AS clang_setup
 RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key| apt-key add -
@@ -19,5 +19,5 @@ RUN /vcpkg/bootstrap-vcpkg.sh
 ENV VCPKG_INSTALLATION_ROOT=/vcpkg
 
 FROM vcpkg_setup AS final
-RUN python -m ensurepip --upgrade
-RUN pip install cmakelang
+RUN python3 -m ensurepip --upgrade
+RUN pip3 install cmakelang