Update Dockerfile

Author: trivarialthea

Dockerfile

@@ -1,13 +1,14 @@
-FROM python:3-slim-buster
+FROM ubuntu:latest
 
-RUN apt update && apt install -y curl build-essential g++ git
+RUN apt update && apt install -y curl build-essential g++ git python3
 
 # Create a non-root user and group
 RUN useradd -s /bin/sh -d /home/platformio -m docker
 USER docker:docker
 
 # Install PlatformIO Core
-RUN python3 -c "$(curl -fsSL https://raw.githubusercontent.com/platformio/platformio-core-installer/master/get-platformio.py)"
+RUN curl -fsSL -o get-platformio.py https://raw.githubusercontent.com/platformio/platformio-core-installer/master/get-platformio.py
+RUN python3 get-platformio.py
 ENV PATH=/home/platformio/.platformio/penv/bin:$PATH
 
 # Clone MarlinFirmware repository, checkout latest release tag