ci: use app key for gh-pages action #2115

# to view logs

Job	Run time
cancel-previous-runs	2s
Check code coverage (branch)	5m 58s
cargo-test-workspace	5m 31s
cargo-clippy	10s
build fuelup release binaries	0s
cargo-fmt-check	5s
check-scripts	9s
lint-toml-files	4s
Try fuelup installation with fuelup-init (ubuntu-latest)	15s
Try fuelup installation with fuelup-init (macos-latest)	23s
Do post-release checks	0s
publish-check	0s
notify-slack-on-failure	0s
	12m 37s

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