Changed file structure

common/debian/apps/etcher.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+install_etcher() {
+    echo 'Installing Etcher'
+    echo "deb https://deb.etcher.io stable etcher" | sudo tee /etc/apt/sources.list.d/balena-etcher.list
+    sudo apt-key adv --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 379CE192D401AB61
+    sudo apt update -y
+    sudo apt install balena-etcher-electron -y
+}