build: pin brightnessctl in a persistent local Gentoo overlay

image/overlay/metadata/layout.conf

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+masters = gentoo
+thin-manifests = true
+sign-manifests = false

image/overlay/profiles/repo_name

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+hydra

image/overlay/sys-apps/brightnessctl/Manifest

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+DIST brightnessctl-0.5.1.tar.gz 8284 BLAKE2B 7d2226aae10fddc606c5ce71ed4a04eda583acf245ea1532d8730c73dc02ea7aeed47a0e25ca7f9d40e7b0170bb08d87617e9f4aa082495e78894982870ca7cc SHA512 41ac86357b3b5a3d54a043140a6bdb1fb68d5080a16e86692059ad58f4b9134a8532432a3f664c70c665a4ad73ea8a94cc9b88fa84abc28f0356b8b397aaebc7

image/overlay/sys-apps/brightnessctl/brightnessctl-0.5.1.ebuild

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+# HydraOS local package for the pinned Gentoo snapshot.
+EAPI=8
+inherit toolchain-funcs udev
+DESCRIPTION="Read and control backlight brightness without privileged launchers"
+HOMEPAGE="https://github.com/Hummer12007/brightnessctl"
+SRC_URI="https://github.com/Hummer12007/brightnessctl/archive/refs/tags/${PV}.tar.gz -> ${P}.tar.gz"
+LICENSE="MIT"
+SLOT="0"
+KEYWORDS="amd64"
+RDEPEND="virtual/udev"
+src_compile() {
+    emake CC="$(tc-getCC)" VERSION="${PV}"
+}
+src_install() {
+    # Upstream's udev mode uses 0755, never its alternate setuid mode.
+    emake DESTDIR="${D}" PREFIX="${EPREFIX}/usr" UDEVDIR="${EPREFIX}$(get_udevdir)/rules.d" INSTALL_UDEV_RULES=1 install
+    dodoc README.md LICENSE
+}

image/portage/repos.conf/hydra.conf

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+[hydra]
+location = /var/db/repos/hydra
+masters = gentoo
+auto-sync = no

image/sources.json

@@ -13,5 +13,15 @@
   },
   "keyring_url": "https://qa-reports.gentoo.org/output/service-keys.gpg",
   "keyring_sha256": "9fe40114c956c4c4d593f6e961ac9a994b0772863f4e685608fbdd8d77e39748",
-  "binhost": "https://distfiles.gentoo.org/releases/amd64/binpackages/23.0/x86-64/"
+  "binhost": "https://distfiles.gentoo.org/releases/amd64/binpackages/23.0/x86-64/",
+  "local_packages": [
+    {
+      "atom": "sys-apps/brightnessctl",
+      "version": "0.5.1",
+      "url": "https://github.com/Hummer12007/brightnessctl/archive/refs/tags/0.5.1.tar.gz",
+      "filename": "brightnessctl-0.5.1.tar.gz",
+      "sha256": "a68869e23f56ac4f2e28f1783002810ddbf10f95e1af9b48b2912fb169f46994",
+      "license": "MIT"
+    }
+  ]
 }