Add files.

portage/bashrc

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+# This hook is neccesary for automatic updating of the cfg-update index, please do not modify it!
+pre_pkg_setup() {
+	[[ $ROOT = / ]] && cfg-update --index
+}
+
+function pre_pkg_preinst() {
+    # This hook signs any out-of-tree kernel modules.
+    if [[ "$(type -t linux-mod_pkg_preinst)" != "function" ]]; then
+        # The package does not seem to install any kernel modules.
+        return
+    fi
+    # Get the signature algorithm used by the kernel.
+    local module_sig_hash="$(grep -Po '(?<=CONFIG_MODULE_SIG_HASH=").*(?=")' "${KERNEL_DIR}/.config")"
+    # Get the key file used by the kernel.
+    local module_sig_key="$(grep -Po '(?<=CONFIG_MODULE_SIG_KEY=").*(?=")' "${KERNEL_DIR}/.config")"
+    module_sig_key="${module_sig_key:-certs/signing_key.pem}"
+    # Path to the key file or PKCS11 URI
+    if [[ "${module_sig_key#pkcs11:}" == "${module_sig_key}" && "${module_sig_key#/}" == "${module_sig_key}" ]]; then
+        local key_path="${KERNEL_DIR}/${module_sig_key}"
+    else
+        local key_path="${module_sig_key}"
+    fi
+    # Certificate path
+    local cert_path="${KERNEL_DIR}/certs/signing_key.x509"
+    # Sign all installed modules before merging.
+    find "${D%/}/${INSDESTTREE#/}/" -name "*.ko" -exec "${KERNEL_DIR}/scripts/sign-file" "${module_sig_hash}" "${key_path}" "${cert_path}" '{}' \;
+}

portage/repos.conf

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+# Portage repos.conf
+
+# COpyright 2022 Inference
+
+
+[musl]
+location = /var/db/repos/musl
+sync-type = git
+sync-uri = https://anongit.gentoo.org/git/proj/musl.git
+
+[inferencium]
+location = /var/db/repos/inferencium
+sync-type = git
+sync-uri = https://codeberg.org/inference/inferencium.git
+
+[yemou-overlay]
+location = /var/db/repos/yemou-overlay
+sync-type = git
+sync-uri = https://github.com/yemouu/yemou-overlay.git