Add stage3

- Install libnss-mdns package
- Sudo without password
- Add and enable vision service

stage3/00-install-packages/00-packages

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+libnss-mdns

stage3/01-sudo-without-passwd/00-run.sh

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+#!/bin/bash -e
+
+# Enable password-less sudo for everyone
+echo "%sudo ALL=(ALL) NOPASSWD:ALL" >> "${ROOTFS_DIR}/etc/sudoers"

stage3/02-add-vision-service/00-run.sh

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+#!/bin/bash -e
+
+# Install the service so the system can run it
+install -m 755 files/vision.service "${ROOTFS_DIR}/etc/systemd/system"
+
+on_chroot << EOF
+# Reload the system services
+sudo systemctl daemon-reload
+
+# Enable our vision service on startup
+sudo systemctl enable vision
+EOF

stage3/02-add-vision-service/files/vision.service

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+[Unit]
+Description=FRC Vision Service
+
+[Service]
+Type=simple
+Restart=always
+ExecStart=/home/vision/visionProgram
+WorkingDirectory=/home/vision
+
+[Install]
+WantedBy=multi-user.target

stage3/prerun.sh

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+#!/bin/bash -e
+
+if [ ! -d "${ROOTFS_DIR}" ]; then
+	copy_previous
+fi