Format Fortran code

This MR creates a linter and a CI step of linter for fortran code formatting.

assigned to @b382190

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• ab7851f7 - Update .gitlab-ci.yml file

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• 07a1d4e3 - Format files

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• 34e4f472 - update gitlab CI pipeline

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added 1 commit

• 4280b915 - Update linting rule

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• 5976b5f7 - Add beautify script

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added 29 commits

• 5976b5f7...8137bc69 - 21 commits from branch master
• 7ad10d54 - Try .gitlab-ci.yml file
• 556b337f - Update .gitlab-ci.yml file
• 8f4a3179 - Update .gitlab-ci.yml file
• c7a53b0b - Format files
• 5c463aa1 - update gitlab CI pipeline
• 1c69dd6f - Update linting rule
• c4864fbd - Add beautify script
• 59682413 - Format again after rebase

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• 37dd630d - Test pipeline without if

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• 9c3b450d - Remove pipelines rules for linting

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The setting of Fortran linting matches the standards set in the documentation. (https://gitlab.dkrz.de/icon/icon-nwp/-/blob/master/doc/style/icon_standard.tex#L802)
Using indents of size 2 and upper case for keywords.

marked this merge request as ready

changed title from Fortran linting to Format Fortran code

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• 5904ede4 - Format test files

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• fc72f056 - Print message if fprettify not installed

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resolved all threads

mentioned in commit 3eec3353

merged