docker: let build user sudo without password

Signed-off-by: Olof Johansson <olof@lixom.net>

docker/entry.sh

@@ -21,6 +21,10 @@ _GID=$2
 groupadd -g $_GID build 2>/dev/null || true
 useradd -s /bin/bash -m -u $_UID -g $_GID build
 
+# passwordless sudo for build user
+adduser build sudo
+echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
 # preconfigure git identity
 sudo -u build git config --global user.name "LX2160A Toolchain Container"
 sudo -u build git config --global user.email "support@solid-run.com"