tinkerbell: Add btrfs-progs and gawk to Dockerfile
This commit adds additional packages which are required in the
`flatcar-install` script.
FROM ubuntu
RUN apt update && \
- apt install -y udev gpg wget
+ apt install -y udev gpg wget btrfs-progs gawk
RUN wget https://raw.githubusercontent.com/flatcar-linux/init/flatcar-master/bin/flatcar-install -O /usr/local/bin/flatcar-install && \
chmod +x /usr/local/bin/flatcar-install
