Add microzig_flash_end to linker script (#363) #6

Job	Run time
Build Website	27s
Build (ubuntu-latest)	18s
Dry Run Packaging	1m 22s
Build (windows-latest)	1m 44s
Build Examples (espressif/esp)	2m 15s
Build (macos-latest)	27s
Check that stm32 generated code is up to date	45s
Build Examples (gigadevice/gd32)	2m 7s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	22s
Build Examples (microchip/avr)	2m 15s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	28s
Build Examples (microchip/atsam)	1m 58s
Unit Test Regz (ubuntu-latest)	17s
Unit Test UF2 (ubuntu-latest)	16s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	21s
Build Examples (nordic/nrf5x)	2m 4s
Unit Test Regz (windows-latest)	1m 35s
Unit Test UF2 (windows-latest)	1m 20s
Unit Test Ports (windows-latest, gigadevice/gd32)	59s
Unit Test Regz (macos-latest)	26s
Build Examples (nxp/lpc)	2m 4s
Unit Test UF2 (macos-latest)	35s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 18s
Build Examples (stmicro/stm32)	29s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 10s
Build Examples (raspberrypi/rp2xxx)	2m 18s
Unit Test Ports (macos-latest, gigadevice/gd32)	24s
Build Examples (wch/ch32v)	2m 12s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	30s
Unit Test Ports (macos-latest, stmicro/stm32)	26s
	33m 12s

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