Syntax "errors" and formatting inconsistencies

[devtobi]

I found various wrong syntax usages in the action files (workflow files might be affected as well).
One example would be the definition of type for action inputs. This is actually not possible in actions (but just in workflows). See https://docs.github.com/en/actions/sharing-automations/creating-actions/metadata-syntax-for-github-actions#inputs for more information.
Also number inputs aren't really numbers internally so should be written as string.

Another example is the interpolation of variables.
In some cases those look like this ${{ inputs.node-version }} (with spaces) or like this ${{inputs.app-path}} (without spaces).

We should try to keep it consistent in the future and adhere to the syntax definition of GitHub (although the syntax is pretty strange in some places).