git: support .tarignore

[stefanprodan]

When creating artifacts from Git repositories, we could detect if the .tarignore file is present in the root dir and pass to the tar command.

Ref: --exclude-ignore=.tarignore

[hiddeco]

I do not think detection of the file is a requirement as tar itself already checks if the file is present.

--exclude-ignore=file
Before dumping a directory, tar checks if it contains file. If so, exclusion patterns are read from this file. The patterns affect only the directory itself.

I am also wondering if we should not be using --exclude-ignore-recursive as

Same as --exclude-ignore, except that the patterns read affect both the directory where file resides and all its subdirectories.

[hiddeco]

Another interesting flag is --exclude-vcs which automatically detects and excludes the files from the most common VCS.

[stefanprodan]

Maybe we should have our own .sourceignore and use that for tar, to make it explicit.

[hiddeco]

What do we gain by introducing a new standard instead of implementing the default ways of working with the solution used and/or declaring the (opt-in?) rule of excluding the VCS related files (.git, .gitignore, .gitattributes, etc)?

[stefanprodan]

. sourceignore is not a new standard, when present it is used in tar --exclude-ignore=.sourceignore.