Fix local-preview project-root-only flag.

[armooo]

It seems 9274791 which added .gitignore support inadvertently removed packagePath from the call to GetIgnoreMatcherFn.

Fixes: #287

[tomasmik]

Will this now include and archive dirs in the root which we don't actually care about?

[armooo]

I don't think it would. Do you have an example you can think of where this would happen? Here are a few tests I ran.

The test setup.

> tree
.
├── a
│   ├── bar
│   └── foo
├── b
│   ├── bar
│   └── foo
└── c
    ├── base
    └── foo

4 directories, 6 files

> cat .gitignore
c/**

Without --project-root-only from the root.

> spacectl stack local-preview --id test --no-upload
Packing local workspace...
No upload flag was provided, will not create run, saved archive at: /var/folders/3c/1nl1q9816zd66cy4lp5fdxjw0000gn/T/spacectl/local-workspace/01JK6GJDA51NCGBS0FJWR23KV9.tar.gz

> tar -tf /var/folders/3c/1nl1q9816zd66cy4lp5fdxjw0000gn/T/spacectl/local-workspace/01JK6GJDA51NCGBS0FJWR23KV9.tar.gz
01JK6GJDA51NCGBS0FJWR23KV9/
01JK6GJDA51NCGBS0FJWR23KV9/.gitignore
01JK6GJDA51NCGBS0FJWR23KV9/a/
01JK6GJDA51NCGBS0FJWR23KV9/a/bar
01JK6GJDA51NCGBS0FJWR23KV9/a/foo
01JK6GJDA51NCGBS0FJWR23KV9/b/
01JK6GJDA51NCGBS0FJWR23KV9/b/bar
01JK6GJDA51NCGBS0FJWR23KV9/b/foo

Without --project-root-only from subdir a.

> ~/src/spacectl/spacectl stack local-preview --id test --no-upload
Packing local workspace...
No upload flag was provided, will not create run, saved archive at: /var/folders/3c/1nl1q9816zd66cy4lp5fdxjw0000gn/T/spacectl/local-workspace/01JK6GMXJBHZ5CJ79XS11P1HC2.tar.gz

> tar -tf /var/folders/3c/1nl1q9816zd66cy4lp5fdxjw0000gn/T/spacectl/local-workspace/01JK6GMXJBHZ5CJ79XS11P1HC2.tar.gz
01JK6GMXJBHZ5CJ79XS11P1HC2/
01JK6GMXJBHZ5CJ79XS11P1HC2/.gitignore
01JK6GMXJBHZ5CJ79XS11P1HC2/a/
01JK6GMXJBHZ5CJ79XS11P1HC2/a/bar
01JK6GMXJBHZ5CJ79XS11P1HC2/a/foo
01JK6GMXJBHZ5CJ79XS11P1HC2/b/
01JK6GMXJBHZ5CJ79XS11P1HC2/b/bar
01JK6GMXJBHZ5CJ79XS11P1HC2/b/foo

With --project-root-only from subdir a.

> ~/src/spacectl/spacectl stack local-preview --id test --project-root-only --no-upload
Packing 'a' as local workspace...
No upload flag was provided, will not create run, saved archive at: /var/folders/3c/1nl1q9816zd66cy4lp5fdxjw0000gn/T/spacectl/local-workspace/01JK6GQ99BB9CQXXMJMXRRSW0G.tar.gz

> tar -tf /var/folders/3c/1nl1q9816zd66cy4lp5fdxjw0000gn/T/spacectl/local-workspace/01JK6GQ99BB9CQXXMJMXRRSW0G.tar.gz
01JK6GQ99BB9CQXXMJMXRRSW0G/a/bar
01JK6GQ99BB9CQXXMJMXRRSW0G/a/foo