[CI] Only push metrics from master #1696

Job	Run time
tock-build	2m 8s
esp-build	6m 38s
rpi-build	0s
arduino:avr:mega	16m 59s
arduino:mbed:nano33ble	10m 4s
arduino:mbed:envie_m4	8m 51s
rpi-pico-build	2m 12s
arduino:megaavr:uno2018	3m 17s
arduino:sam:arduino_due_x	3m 13s
arduino:samd:arduino_zero_native	12m 52s
adafruit:samd:adafruit_feather_m0	6m 53s
adafruit:nrf52:feather52832	6m 36s
esp32:esp32:esp32	8m 19s
esp8266:esp8266:generic	7m 11s
STMicroelectronics:stm32:GenF3	5m 55s
STMicroelectronics:stm32:Nucleo_64	4m 26s
stm32duino:STM32F1:mapleMini	2m 29s
MegaCoreX:megaavr:4809	3m 2s
arduino:mbed_rp2040:pico	9m 1s
rp2040:rp2040:rpipico	8m 23s
CubeCell:CubeCell:CubeCell-Board	2m 56s
MegaCore:avr:1281	2m 36s
teensy:avr:teensy41	3m 16s
arduino:renesas_uno:minima	4m 31s
SiliconLabs:silabs:xg24explorerkit	9m 15s
rpi-test	0s
metrics	0s
	2h 31m 3s

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