Release v0.18.2-1

Updated CMake version to 3.20.5

Zephyr is increasing the minimum required CMake version to 3.20.0.

Therefore docker needs to be updated accordingly, and 3.20.5 is the
latest in the 3.20 series.

See also: https://github.com/zephyrproject-rtos/zephyr/pull/37575

Signed-off-by: Torsten Rasmussen <[email protected]>

Release v0.18.1-2

Rm Rust support

Release v0.18.1-1

[ci] Build containers on every push