[ci] Upload checksum value for packages

[pandafy]

Since we have already added a functionality to upload packages directly to downloads.openwisp.io, it will be beneficial to also upload checksums for built packages.

This way users will be able to verify the authenticity of downloaded packages.

[nemesifier]

Here's how OpenWRT does it: https://downloads.openwrt.org/releases/21.02.0/packages/mips_24kc/packages/Packages

Would be great to do the same, including the checksum of our packages only.

[nemesifier]

As discussed during the weekly call, the compilation steps generates a file which contains the checksum.
I recommend compiling locally, find the file which contains the checksum and publish it on Google Cloud as "Packages.sha256.checksum".

[Lekhitcoder7]

@nemesifier Can you tell me which file I have to compiled for checksum

[nemesifier]

@nemesifier Can you tell me which file I have to compiled for checksum

the ipk package related to the source code of this project, refer to the CI build and docs for compilation instructions:

openwrt-openwisp-monitoring/.github/workflows/ci.yml

Lines 55 to 88 in 725c2d1

	build:
	name: Build and upload package as artifacts
	runs-on: ubuntu-24.04
	env:
	BUILD_DIR: '/home/runner/work/build'
	DOWNLOADS_DIR: '/home/runner/work/downloads'
	CORES: 2
	steps:
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.event.pull_request.head.sha }}
	- name: Cache OpenWrt dependencies
	id: cache
	uses: actions/cache@v4
	env:
	cache-name: cache-openwrt-dependencies
	with:
	path: '/home/runner/work/build'
	key: ${{ runner.os }}-build-${{ env.cache-name }}
	- name: Set Environment
	run: |
	echo "START_TIME=$(date +"%Y-%m-%d")" >> $GITHUB_ENV
	echo "COMMIT_SHA=$(git log --pretty=format:'%h' -n 1)" >> $GITHUB_ENV
	- name: Install dependencies
	run: sudo apt install gawk
	- name: Run Build
	run: ./runbuild
	env:
	CI_CACHE: ${{ steps.cache.outputs.cache-hit }}