[ISSUE] yadm encrypt fails, it must depend on tar

[voidlinux-github@inbox.vuxu.org]

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New issue by jirib on void-packages repository

https://github.com/void-linux/void-packages/issues/18827

Description:
<!-- Don't request update of package. We have a script for that. https://alpha.de.repo.voidlinux.org/void-updates/void-updates.txt . However, a quality pull request may help. -->
### System

* xuname:  
```
Void 5.4.17_1 x86_64 GenuineIntel notuptodate rF
```
* package:  
```
$ xbps-query yadm
architecture: noarch
build-date: 2019-12-18 00:18 UTC
filename-sha256: 50fafe6244377bd2580b655919eb66d0354dd77e1c5bad05cd5fc1cd0b2a1c41
filename-size: 22KB
homepage: https://thelocehiliosan.github.io/yadm/
install-date: 2020-02-05 15:04 CET
installed_size: 79KB
license: GPL-3.0-or-later
maintainer: John <johnz@posteo.net>
metafile-sha256: 1c64d4667d23750fc319a8cc4f2ae35aeffeb446df9cc335c4cec0581ef55908
pkgver: yadm-2.3.0_1
repository: https://alpha.de.repo.voidlinux.org/current
short_desc: Yet Another Dotfiles Manager
source-revisions: yadm:17e2a116b1
state: installed
```
### Expected behavior

`yadm encrypt` should work out of the box

### Actual behavior

```
$ yadm encrypt
Encrypting the following files:
...
/usr/bin/yadm: line 888: tar: command not found
gpg: problem with the agent: Inappropriate ioctl for device
gpg: error creating passphrase: Operation cancelled
gpg: symmetric encryption of '[stdin]' failed: Operation cancelled
ERROR: Unable to write /home/jiri/.config/yadm/files.gpg
```
```
$ xbps-query -x yadm
bash>=0
git>=0
gnupg>=0
```
### Steps to reproduce the behavior

```
yadm encrypt
```