add option ignoreFile to ignore file's contents like .gitignore

[its-dibo]

as mentioned in docs the commit will include everything in assets even if it is included in .gitignore.

you can add an option to ignore a file's contents like that

["@semantic-release/git", {
  assets: ["**/*.*"],
  ignoreFile= '.gitignore'
}]

this approach is used by many tools tile eslint and prettier

also, it is a good idea to add an option to include changed files only

[Kenneth-Sills]

Since this hasn't been closed or commented on, I have to imagine the maintainers would be okay with this. I'll make a PR for this sometime soon. 😄

For posterity, this is related to #345 (a duplicate) and #55 (when this behavior was added).

To minimize maintenance burden, I'll make a boolean config flag named respectIgnoreFile. All setting it to true will do is drop the --force we send to the git add command.

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EDIT: PR Created!

[its-dibo]

very nice effort @Kenneth-Sills, you saved too many verbose configurations for many developers with this PR