Add initial docker build script

Author: miloszlagan

build_docker.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Build the docker image
+
+docker buildx build -t lib-builder-husarnet:master \
+    --build-arg LIBBUILDER_CLONE_BRANCH_OR_TAG=master \
+    --build-arg LIBBUILDER_CLONE_SHALLOW=1 \
+    --build-arg LIBBUILDER_CLONE_URL=https://github.com/miloszlagan/esp32-arduino-lib-builder \
+    tools/docker
+
+# Build Arduino libs
+
+docker run --rm -it -v $PWD:/arduino-esp32 -e TERM=xterm-256color lib-builder-husarnet:master ./build.sh