More native Raspberry Pi support

[metalefty]

Resolves: #13

• [ ] Configure WiFi on first time boot using config network-data file from boot partition
• [x] Create new using user-data config file, create new user on first boot
• [x] Configure user SSH settings based on ssh config entry
• [x] Expand root partition (running rootfs-expand command
• [ ] Make config.txt file updated based on user prompt - screen rescan required etc

Wi-Fi configuration on first boot by network-config is not working due to cloud-init bug until we get cloud-init updated to 22.2. However, it is possible in an alternative way. Add the following configuration in user-data instead.

runcmd:
  - [ nmcli, dev, wifi, connect, SSID_TO_CONNECT, password, WI_FI_PASSWORD]

While here, I made some the following additional changes:

• Use swapfile instead of swap partition for flexibility (can change swap size later)
• AL8: exclude Intel Wi-Fi firmware not required on RasPi
• Add missing dnf cache rebuilding to 8-console

I'll update documentation later.

[metalefty]

BTW, could you merge with a merge commit rather than squashing? I would like to commit history of each commit.

[metalefty]

Some adjustments are needed for GNOME. gnome-initial-setup is not ignited due to existence of the default user almalinux. Others are working fine for me.