Integrate gitlab-ci/optional_fng_install and 2 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@9be2c52b

pipeline:build: Fix indentation of here-doc

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@245e6537

pipeline:build: Make generation of install script optional

The Genio 700 platform doesn't have an fng_install.sh. Currently, the
pipeline fails because of the exit code in the script check.
Make the generation of the install command optional and only show a
warning if the script is missing.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@8fedce8a

pipeline:build: Add MediaTek Genio 700 SoC