dev-python/jaraco-context: Add from Gentoo

It's from Gentoo commit 293c0419c5a5e7415927ebbc44be467a6e2b4603.

It's a dependency of dev-python/jaraco-text and dev-python/nspektr.

sdk_container/src/third_party/portage-stable/dev-python/jaraco-context/Manifest

@@ -0,0 +1 @@
+DIST jaraco.context-4.1.1.tar.gz 7615 BLAKE2B 5734da1c55420c45520aea57398e66a3d880a555c76650bcaf3427911a7814be92f4a879219c8ccf3c808fdf00d3a77b76e68a93ef3fdad4ea50550188118317 SHA512 e01d3bd7b4eb712d00aba3fc40a78a5484141fcacf5bc772287a35ac81eca4c9744963679daadf6a170cf2ec26234243e602c89f71833fe84175ac39fb401453

sdk_container/src/third_party/portage-stable/dev-python/jaraco-context/jaraco-context-4.1.1-r2.ebuild

@@ -0,0 +1,45 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# please keep this ebuild at EAPI 7 -- sys-apps/portage dep
+EAPI=7
+
+DISTUTILS_USE_PEP517=flit
+PYTHON_COMPAT=( python3_{8..11} pypy3 )
+
+inherit distutils-r1
+
+MY_P=${P/-/.}
+DESCRIPTION="Context managers by jaraco"
+HOMEPAGE="https://github.com/jaraco/jaraco.context"
+SRC_URI="mirror://pypi/${PN:0:1}/${PN/-/.}/${MY_P}.tar.gz"
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+
+distutils_enable_tests pytest
+
+src_configure() {
+	grep -q 'build-backend = "setuptools' pyproject.toml ||
+		die "Upstream changed build-backend, recheck"
+	# write a custom pyproject.toml to ease setuptools bootstrap
+	cat > pyproject.toml <<-EOF || die
+		[build-system]
+		requires = ["flit_core >=3.2,<4"]
+		build-backend = "flit_core.buildapi"
+
+		[project]
+		name = "jaraco.context"
+		version = "${PV}"
+		description = "Context managers by jaraco"
+	EOF
+}
+
+python_install() {
+	distutils-r1_python_install
+	# rename to workaround a bug in pkg_resources
+	# https://bugs.gentoo.org/834522
+	mv "${D}$(python_get_sitedir)"/jaraco{_,.}context-${PV}.dist-info || die
+}

sdk_container/src/third_party/portage-stable/dev-python/jaraco-context/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>python@gentoo.org</email>
+		<name>Python</name>
+	</maintainer>
+	<stabilize-allarches/>
+	<upstream>
+		<remote-id type="pypi">jaraco.context</remote-id>
+	</upstream>
+</pkgmetadata>