Add portage config

portage/ccache.conf

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+max_size = 30.0G
+

portage/make.conf

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+# These settings were set by the catalyst build script that automatically
+# built this stage.
+# Please consult /usr/share/portage/config/make.conf.example for a more
+# detailed example.
+COMMON_FLAGS="-march=bdver4 -mtune=native -O2 -pipe"
+CFLAGS="${COMMON_FLAGS}"
+CXXFLAGS="${COMMON_FLAGS} -mno-rdrnd"
+FCFLAGS="${COMMON_FLAGS}"
+FFLAGS="${COMMON_FLAGS}"
+USE="-kde -gnome -bluetooth -systemd -nvidia -pipewire -jack -doc\
+     -telemetry -cuda\
+      X xorg elogind pulseaudio alsa cjk unicode tkip cli libcaca vulkan\
+      stack-realign modplug xinerama jpegxl" # vulkan layers vulkan-overlay zink shaders cube
+
+PORTAGE_NICENESS="10"
+MAKEOPTS="-j2"
+# KEYWORDS=""
+
+# This sets the language of build output to English.
+# Please keep this setting intact when reporting bugs.
+LC_MESSAGES=C.utf8
+
+ACCEPT_LICENSE="*"
+ACCEPT_KEYWORDS="**"
+
+GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles/"
+
+GRUB_PLATFORMS="efi-64"
+INPUT_DEVICES="libinput synaptics"
+VIDEO_CARDS="amdgpu radeonsi"
+
+FEATURES="ccache"
+CCACHE_DIR="/var/cache/ccache"
+QEMU_USER_TARGETS="x86_64 i386"
+QEMU_SOFTMMU_TARGETS="i386 x86_64"