temp/gnome-software-plugin-apk: upgrade to 0.8.1 and sync APKBUILD with upstream

• add install_if to pull in w/ gnome-software - https://gitlab.alpinelinux.org/alpine/aports/-/commit/90b924a3346678f37b0a1a0e63daa4d677e8c662
• use abuild-meson & meson compile/test/install - https://gitlab.alpinelinux.org/alpine/aports/-/commit/47360782abaf34cd0a1cc746a6bbbaa5966b7515
• use apk-polkit-rs instead of apk-polkit - https://gitlab.alpinelinux.org/alpine/aports/-/commit/0f6c2d95f145cecd9a62c91dcb5be98e4fe01995
• upgrade to 0.8.1 https://gitlab.alpinelinux.org/alpine/aports/-/commit/ce795a4d2776a088c8bc830e8fb7c9e29085e80b
• don't pull in alpinelinux-apppstream-data https://gitlab.alpinelinux.org/alpine/aports/-/commit/c35a1b4ba76e5eacc8db2e1fe9819334fd1211d3

NOTE: alpinelinux-apppstream-data was removed in https://gitlab.alpinelinux.org/alpine/aports/-/commit/946967b01f34f78719ecf0ff87e90eec30f147d7

Only build-tested for now, supposed to fix upstream-compat issue https://gitlab.com/postmarketOS/monitoring/-/jobs/747526220