root@OpenWrt:~# ubus call system board
{
    "kernel": "6.6.63",
    "hostname": "OpenWrt",
    "system": "ARMv7 Processor rev 3 (v7l)",
    "model": "Bananapi BPI-R2",
    "board_name": "bananapi,bpi-r2",
    "rootfs_type": "squashfs",
    "release": {
        "distribution": "OpenWrt",
        "version": "SNAPSHOT",
        "revision": "r28214-5a4eb56a7b",
        "target": "mediatek/mt7623",
        "description": "OpenWrt SNAPSHOT r28214-5a4eb56a7b",
        "builddate": "1732829601"
    }
}
root@OpenWrt:~# opkg update
-ash: opkg: not found
root@OpenWrt:~# 
root@OpenWrt:~# 
root@OpenWrt:~# apk update
fetch https://downloads.openwrt.org/snapshots/targets/mediatek/mt7623/packages/packages.adb
fetch https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/base/packages.adb
fetch https://downloads.openwrt.org/snapshots/targets/mediatek/mt7623/kmods/6.6.63-1-6cf207d61805050e191d4ae5ea32d2d8/packages.adb
fetch https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/luci/packages.adb
fetch https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/packages/packages.adb
fetch https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/routing/packages.adb
fetch https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/telephony/packages.adb
 [https://downloads.openwrt.org/snapshots/targets/mediatek/mt7623/packages/packages.adb]
 [https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/base/packages.adb]
 [https://downloads.openwrt.org/snapshots/targets/mediatek/mt7623/kmods/6.6.63-1-6cf207d61805050e191d4ae5ea32d2d8/packages.adb]
 [https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/luci/packages.adb]
 [https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/packages/packages.adb]
 [https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/routing/packages.adb]
 [https://downloads.openwrt.org/snapshots/packages/arm_cortex-a7_neon-vfpv4/telephony/packages.adb]
OK: 10655 distinct packages available
root@OpenWrt:~# apk install luci
ERROR: 'install' is not an apk command. See 'apk --help'.
root@OpenWrt:~# apk --help
apk-tools 3.0.0_pre20241113, compiled for armv7.

usage: apk [<OPTIONS>...] COMMAND [<ARGUMENTS>...]

Package installation and removal:
  add        Add or modify constraints in WORLD and commit changes
  del        Remove constraints from WORLD and commit changes

System maintenance:
  fix        Fix, reinstall or upgrade packages without modifying WORLD
  update     Update repository indexes
  upgrade    Install upgrades available from repositories
  cache      Manage the local package cache

Querying package information:
  info       Give detailed information about packages or repositories
  list       List packages matching a pattern or other criteria
  dot        Render dependencies as graphviz graphs
  policy     Show repository policy for packages
  search     Search for packages by name or description

Repository and package maintenance:
  mkndx      Create repository index (v3) file from packages
  mkpkg      Create package (v3)
  index      Create repository index (v2) file from packages
  fetch      Download packages from repositories to a local directory
  manifest   Show checksums of package contents
  extract    Extract package file contents
  verify     Verify package integrity and signature
  adbsign    Sign, resign or recompress v3 packages and indexes

Miscellaneous:
  audit      Audit system for changes
  stats      Show statistics about repositories and installations
  version    Compare package versions or perform tests on version strings
  adbdump    Dump v3 files in textual representation
  adbgen     Generate v3 files from text representation
  convdb     Convert v2 installed database to v3 format
  convndx    Convert v2 indexes to v3 format

This apk has coffee making abilities.
For more information: man 8 apk
root@OpenWrt:~# apk add luci
( 1/27) Installing cgi-io (2022.08.10~901b0f04-r21)
Executing cgi-io-2022.08.10~901b0f04-r21.post-install
( 2/27) Installing liblucihttp0 (2023.03.15~9b5b683f-r1)
Executing liblucihttp0-2023.03.15~9b5b683f-r1.post-install
( 3/27) Installing liblucihttp-ucode (2023.03.15~9b5b683f-r1)
Executing liblucihttp-ucode-2023.03.15~9b5b683f-r1.post-install
( 4/27) Installing rpcd (2024.09.17~9f4b86e7-r1)
Executing rpcd-2024.09.17~9f4b86e7-r1.post-install
( 5/27) Installing rpcd-mod-file (2024.09.17~9f4b86e7-r1)
Executing rpcd-mod-file-2024.09.17~9f4b86e7-r1.post-install
( 6/27) Installing rpcd-mod-luci (20240305-r1)
Executing rpcd-mod-luci-20240305-r1.post-install
( 7/27) Installing rpcd-mod-ucode (2024.09.17~9f4b86e7-r1)
Executing rpcd-mod-ucode-2024.09.17~9f4b86e7-r1.post-install
( 8/27) Installing ucode-mod-html (1)
Executing ucode-mod-html-1.post-install
( 9/27) Installing ucode-mod-math (2024.07.22~b610860d-r3)
Executing ucode-mod-math-2024.07.22~b610860d-r3.post-install
(10/27) Installing luci-base (24.333.66601~bbc4a90)
luci-base-24.333.66601~bbc4a90: installing file to etc/config/luci.apk-new
Executing luci-base-24.333.66601~bbc4a90.post-install
(11/27) Installing luci-app-package-manager (24.333.66601~bbc4a90)
Executing luci-app-package-manager-24.333.66601~bbc4a90.post-install
(12/27) Installing luci-app-firewall (24.333.66601~bbc4a90)
Executing luci-app-firewall-24.333.66601~bbc4a90.post-install
(13/27) Installing libiwinfo-data (2024.10.20~b94f066e-r1)
Executing libiwinfo-data-2024.10.20~b94f066e-r1.post-install
(14/27) Installing libiwinfo20230701 (2024.10.20~b94f066e-r1)
Executing libiwinfo20230701-2024.10.20~b94f066e-r1.post-install
(15/27) Installing rpcd-mod-iwinfo (2024.09.17~9f4b86e7-r1)
Executing rpcd-mod-iwinfo-2024.09.17~9f4b86e7-r1.post-install
(16/27) Installing luci-mod-network (24.333.66601~bbc4a90)
Executing luci-mod-network-24.333.66601~bbc4a90.post-install
(17/27) Installing luci-mod-status (24.333.66601~bbc4a90)
Executing luci-mod-status-24.333.66601~bbc4a90.post-install
(18/27) Installing luci-mod-system (24.333.66601~bbc4a90)
Executing luci-mod-system-24.333.66601~bbc4a90.post-install
(19/27) Installing luci-mod-admin-full (24.333.66601~bbc4a90)
Executing luci-mod-admin-full-24.333.66601~bbc4a90.post-install
(20/27) Installing luci-proto-ipv6 (24.333.66601~bbc4a90)
Executing luci-proto-ipv6-24.333.66601~bbc4a90.post-install
(21/27) Installing luci-proto-ppp (24.333.66601~bbc4a90)
Executing luci-proto-ppp-24.333.66601~bbc4a90.post-install
(22/27) Installing luci-theme-bootstrap (24.333.66601~bbc4a90)
Executing luci-theme-bootstrap-24.333.66601~bbc4a90.post-install
/luci-static/bootstrap
/luci-static/bootstrap-dark
/luci-static/bootstrap-light
(23/27) Installing rpcd-mod-rrdns (20170710)
Executing rpcd-mod-rrdns-20170710.post-install
(24/27) Installing uhttpd (2023.06.25~34a8a74d-r4)
uhttpd-2023.06.25~34a8a74d-r4: installing file to etc/config/uhttpd.apk-new
Executing uhttpd-2023.06.25~34a8a74d-r4.post-install
4+0 records in
4+0 records out
(25/27) Installing uhttpd-mod-ubus (2023.06.25~34a8a74d-r4)
Executing uhttpd-mod-ubus-2023.06.25~34a8a74d-r4.post-install
4+0 records in
4+0 records out
(26/27) Installing luci-light (24.333.66601~bbc4a90)
Executing luci-light-24.333.66601~bbc4a90.post-install
(27/27) Installing luci (24.333.66601~bbc4a90)
Executing luci-24.333.66601~bbc4a90.post-install
OK: 11 MiB in 141 packages
root@OpenWrt:~# 

root@OpenWrt:~# apk list | grep opkg
root@OpenWrt:~# 
root@OpenWrt:~# 
root@OpenWrt:~# apk search opkg
luci-app-package-manager-24.333.66601~bbc4a90
root@OpenWrt:~#