testing/py3-sstash: modernize

- Use modern style
- Explain why check is disabled

testing/py3-sstash/APKBUILD

@@ -9,20 +9,16 @@ url="https://github.com/realcr/sstash"
 arch="noarch"
 license="MIT"
 depends="python3 py3-pynacl py3-click"
-makedepends="python3-dev py3-pytest"
-install=""
-options="!check"
-subpackages=""
+makedepends="py3-setuptools py3-pytest"
+options="!check" # PYPI tarball has no tests, GitHub has no releases
 source="https://files.pythonhosted.org/packages/source/${_pkgname:0:1}/$_pkgname/$_pkgname-$pkgver.tar.gz"
 builddir="$srcdir/$_pkgname-$pkgver"
 
 build() {
-	cd "$builddir"
 	python3 setup.py build
 }
 
 package() {
-	cd "$builddir"
 	python3 setup.py install --prefix=/usr --root="$pkgdir"
 }