[Bug 15346] New: tar does not have --format option + aliases for formats

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15346

            Bug ID: 15346
           Summary: tar does not have --format option + aliases for
                    formats
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned at busybox.net
          Reporter: anonymous.maarten at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

The -H/--format option allows one to choose an archive format.

GNU tar also provides direct options to select a format.

e.g. --posix as an alias for --format=posix
 or  --portability for --format=v7.

I ran into this issue in a GitHub workflow in an Alpine docker container, which
uses busybox by default.

The actions/cache action requires a "Posix-compliant tar".
It looks like busybox already generates posix archives.

I have pasted the error message below. The error is because of an --posix
option.

```
/usr/bin/docker exec 
fe3da0b58a8d73eeeaa346c3db67e6e1f7f0bf9896d148552db4c9077d01788d sh -c "cat
/etc/*release | grep ^ID"
/bin/tar --posix -cf cache.tgz --exclude cache.tgz -P -C /__w/SDL/SDL
--files-from manifest.txt -z
/bin/tar: unrecognized option: posix
BusyBox v1.35.0 (2022-11-19 10:13:10 UTC) multi-call binary.

Usage: tar c|x|t [-ZzJjahmvokO] [-f TARFILE] [-C DIR] [-T FILE] [-X FILE]
[LONGOPT]... [FILE]...

Create, extract, or list files from a tar file

        c       Create
        x       Extract
        t       List
        -f FILE Name of TARFILE ('-' for stdin/out)
        -C DIR  Change to DIR before operation
        -v      Verbose
        -O      Extract to stdout
        -m      Don't restore mtime
        -o      Don't restore user:group
        -k      Don't replace existing files
        -Z      (De)compress using compress
        -z      (De)compress using gzip
        -J      (De)compress using xz
        -j      (De)compress using bzip2
        --lzma  (De)compress using lzma
        -a      (De)compress based on extension
        -h      Follow symlinks
        -T FILE File with names to include
        -X FILE File with glob patterns to exclude
        --exclude PATTERN       Glob pattern to exclude
        --overwrite             Replace existing files
        --strip-components NUM  NUM of leading components to strip
        --no-recursion          Don't descend in directories
        --numeric-owner         Use numeric user:group
        --no-same-permissions   Don't restore access permissions
Warning: Failed to save: "/bin/tar" failed with error: The process '/bin/tar'
failed with exit code 1
Warning: Cache save failed.
```

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