Add missing dependency

Dockerfile

@@ -1,9 +1,9 @@
-FROM ubuntu:focal
+FROM ubuntu:latest
 
 RUN apt update \
- && DEBIAN_FRONTEND=noninteractive apt install git-core cmake libusb-1.0-0 python3 python-is-python3 python3-virtualenv ccache -y \
+ && DEBIAN_FRONTEND=noninteractive apt install git-core cmake libusb-1.0-0 python3 python-is-python3 python3-pip python3-virtualenv python3-venv ccache -y \
  && rm /var/lib/apt/lists/* /var/log/* -Rf
 
-RUN git clone --branch=v4.0.1 https://github.com/espressif/esp-idf.git esp-idf \
+RUN git clone https://github.com/espressif/esp-idf.git esp-idf \
  && ./esp-idf/install.sh \
  && rm -Rf esp-idf

README.md

@@ -0,0 +1,6 @@
+# Docker image to build esp32 firmwares with the esp-idf
+
+```
+docker build . -t 0xfeedc0de64/esp-idf-build-environment:v5.0-dev-1093
+docker push 0xfeedc0de64/esp-idf-build-environment:v5.0-dev-1093
+```