Docker build

doc/docker_build.md

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+
+# Building in Docker
+
+### Prerequisities
+- only Docker
+
+No need to install ESP-IDF or anything else. All commands should be run in a project root.
+
+
+## menuconfig
+```
+docker run --rm -it -v .:/project -w /project espressif/idf:v4.3.1 idf.py menuconfig
+```
+
+## Build
+```
+docker run --rm -it -v .:/project -w /project espressif/idf:v4.3.1 idf.py build
+```
+
+## Flash
+Mapping of serial port to container is not simple in windows but you can merge all generated `bin` files into single firmware and flash the firmware manually using some windows tool.
+ - [ESP Tool web flasher](https://espressif.github.io/esptool-js/)
+ - [ESP32 Flash Download tool](https://www.espressif.com/en/support/download/other-tools)
+
+#### Merge bins into single firmware bin file
+```
+docker run --rm -it -v .:/project -w /project/build espressif/idf:v4.3.1    //runs terminal in idf container
+
+esptool.py --chip esp32 merge_bin --output firmware.bin @flash_args         // merges all bin files into firmware.bin
+```
+
+Write `build/firmware.bin` to ESP32 at address 0x0000
+
+
+
+
+--------------------
+### More details
+```
+docker run 
+    --rm                            // Removes container after exit
+    -it                             // runs interactive terminal
+    -v .:/project                   // maps current directory to /project in container
+    -w /project                     // sets working directory inside a container to /project
+    espressif/idf:v4.3.1            // image name + version
+    idf.py menuconfig               // run menuconfig
+```