add support for building via a docker container [remote dev]

docker/builder.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+cd ${SCRIPT_DIR}/..
+mkdir -p ./data/home
+docker run \
+    --rm \
+    -ti \
+    --net host \
+    -v "${PWD}/../:${PWD}/../" \
+    -w "${PWD}" \
+    --name flutter-dev-obtainium \
+    --user $(id -u) \
+    -v ./data/home:/home/${USER} \
+    -e USER=${USER} \
+    -e HOME=/home/${USER} \
+    -e ANDROID_USER_HOME=${HOME}/.android \
+    -e GRADLE_USER_HOME=${HOME}/.gradle \
+    -e PS1="${debian_chroot:+($debian_chroot)}${USER}@\h:\w\$ " \
+    flutter-builder-obtainium