ci: replace GHPAGES_DEPLOY_KEY with MY_REPO_PAT for Pages deployment #22

Job	Run time
generate-matrix	3m 39s
build-firmware (mazduino-lite, boards/mazduino-lite/meta-info.env)	6m 27s
build-firmware (mazduino-mega100-512, boards/mazduino-mega100-512/meta-info.env)	6m 34s
build-firmware (mazduino-mega100, boards/mazduino-mega100/meta-info.env)	6m 54s
build-firmware (mazduino-mini6ch, boards/mazduino-mini6ch/meta-info.env)	7m 41s
build-firmware (mazduino-compact, boards/mazduino-compact/meta-info.env)	7m 29s
	38m 44s

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