adds ignore-path command arguments to executor

[jonfriesen]

Fixes #1621

Description

Allows the command line setting of custom ignore paths via the executor. This follows the style of /kaniko/executor --ignore-path /first/path --ignore-path /second/path.

This change renames initialIgnoreList with defaultIgnoreList and creates a baseIgnoreList which is assigned to ignoreList. This allows ignore paths to be added via the command line --ignore-path argument that persists across DetectFilesystemIgnoreList(...) calls while still allowing the ignoreList to be reset from changes made in flight.

Reviewer Notes

• The code flow looks good.
• Unit tests and or integration tests added.

Release Notes

• adds --ignore-path executor argument to allow custom ignore-path's to be set. This command can be used repeatedly for multiple paths.

[SaschaSchwarze0]

Is it worth listing the new argument in the project's README?

[jonfriesen]

@SaschaSchwarze0 good catch! I'll add it to the README shortly. Thanks :)

[jonfriesen]

@SaschaSchwarze0 updated 🙏

[RufusJWB]

It would be great, if you could sort the command argument description in the README file at the alphabetically correct place. I was searching quite some time for it...