remove manual install step for docker

dot_scripts/executable_bootstrap.sh

@@ -0,0 +1,12 @@
+docker_app=$(find /Applications/ \
+                  -name "Docker.app" -maxdepth 1 -mindepth 1 -type d)
+if [ -z "$docker_app" ]; then
+   echo "Installation of Docker for Mac"
+   curl -o ~/Downloads/Docker.dmg -sL https://download.docker.com/mac/stable/Docker.dmg
+   hdiutil verify ~/Downloads/Docker.dmg
+   hdiutil attach ~/Downloads/Docker.dmg -nobrowse
+   cp -R /Volumes/Docker/Docker.app /Applications/
+   hdiutil detach /Volumes/Docker
+   rm ~/Downloads/Docker.dmg
+   sudo /Applications/Docker.app/Contents/MacOS/Docker --quit-after-install --unattended
+fi