Add ebuild for bupstash backup application

Signed-off-by: Stefan Knoblich <stkn@bitplumber.de>

app-backup/bupstash/bupstash-9999.ebuild

@@ -0,0 +1,34 @@
+
+EAPI="7"
+
+inherit cargo
+
+DESCRIPTION="Easy and efficient encrypted backups"
+HOMEPAGE="https://bupstash.io/"
+LICENSE="MIT"
+
+if [[ "${PV}" == *9999* ]]
+then
+	EGIT_REPO_URI="https://github.com/andrewchambers/bupstash.git"
+	inherit git-r3
+	KEYWORDS=""
+else
+	MY_P="${PN}-v${PV}"
+	SRC_URI="https://github.com/andrewchambers/${PN}/releases/download/v${PV}/${MY_P}-src+deps.tar.gz -> ${P}.tar.gz"
+	KEYWORDS="~amd64 ~x86"
+	S="${WORKDIR}"
+fi
+
+SLOT="0"
+
+DEPEND="dev-libs/libsodium"
+RDEPEND="${DEPEND}"
+
+src_unpack() {
+        if [[ "${PV}" == *9999* ]]; then
+                git-r3_src_unpack
+                cargo_live_src_unpack
+        else
+                cargo_src_unpack
+        fi
+}