update Dockerfile

Dockerfile

@@ -1,18 +1,12 @@
 FROM ubuntu
 ENV TZ=Etc/UTC
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
-RUN apt-get update && apt-get install --yes python3 pip pkg-config libsystemd-dev git
-RUN apt-get update && \
-    apt-get upgrade -y
+RUN apt-get update && apt-get install --yes python3 pip pkg-config libsystemd-dev
 
-RUN apt-get install -y wget build-essential libreadline-gplv2-dev libncursesw5-dev \
-    libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3.7
 
-RUN wget https://www.python.org/ftp/python/3.7.15/Python-3.7.15.tgz && \
-    tar -xvf Python-3.7.15.tgz
-
-RUN ./configure --enable-optimizations && \
-    make altinstall
+# Set python3.7 as the default python
+RUN update-alternatives --set python /usr/bin/python3.7
 
 # Set the working directory in the container to /app
 WORKDIR /app