one empty line

Dockerfile

@@ -1,20 +1,21 @@
-FROM registry.hottis.de/dockerized/base-build-env:latest
+FROM registry.hottis.de/dockerized/base-build-env:1.5.3-bullseye
+
 
 LABEL Maintainer="Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>"
 LABEL ImageName="registry.hottis.de/dockerized/build-env-arduino"
 LABEL HubImageName="wollud1969/build-env-arduino"
 
-ARG ArduinoDownloadUrl=https://github.com/arduino/arduino-cli/releases/download/0.5.0
-ARG ArduinoPackage=arduino-cli_0.5.0_Linux_64bit.tar.gz
+ARG ArduinoDownloadUrl=https://github.com/arduino/arduino-cli/releases/download/0.29.0
+ARG ArduinoPackage=arduino-cli_0.29.0_Linux_64bit.tar.gz
 ARG ArduinoUID="1000"
 ARG ArduinoGID="1000"
 ENV USER arduino
 
 RUN \
   apt update && \
-  apt install -y vim.tiny && \
-  apt install -y python-cheetah && \
-  rm -rf /var/lib/apt/lists/* && \
+  apt upgrade -y && \
+  apt install -y python3-cheetah && \
+  pip install pyserial && \
   cd /tmp && \
   wget ${ArduinoDownloadUrl}/${ArduinoPackage} && \
   tar -xzf ${ArduinoPackage} && \
@@ -34,13 +35,10 @@ RUN \
   arduino-cli core update-index && \
   arduino-cli core install arduino:avr && \
   arduino-cli core install arduino:samd && \
-  arduino-cli core install esp8266:esp8266@2.5.0 && \
-  sed -i 's/#if DEBUG/#ifdef DEBUG/' ~/.arduino15/packages/esp8266/hardware/esp8266/2.5.0/tools/sdk/libc/xtensa-lx106-elf/include/sys/reent.h 
+  arduino-cli core install esp8266:esp8266 && \
+  arduino-cli core install esp32:esp32 && \
+  arduino-cli core install Heltec-esp32:esp32
   
 
 CMD ["/bin/bash"]
 
-
-  
-  
-

VERSION

@@ -1 +0,0 @@
-0.7-0.5.0

arduino-cli.yaml

@@ -4,3 +4,6 @@ arduino_data: /home/arduino/.arduino15
 board_manager:
   additional_urls:
   - http://arduino.esp8266.com/stable/package_esp8266com_index.json
+  - https://dl.espressif.com/dl/package_esp32_index.json
+  - https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/releases/download/0.0.7/package_heltec_esp32_index.json
+