[bazel] inline platforms and remove `platforms.bzl` #375

	name: RISCV Linux CMake

	on:
	push:
	pull_request:
	schedule:
	# min hours day(month) month day(week)
	- cron: '0 0 7,22 * *'

	jobs:
	# Building using the github runner environement directly.
	make:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	targets: [
	[riscv32],
	[riscv64],
	]
	fail-fast: false
	env:
	TARGET: ${{ matrix.targets[0] }}
	steps:
	- uses: actions/checkout@v4
	- name: Build
	run: make --directory=cmake/ci ${TARGET}_build
	- name: Test
	run: make --directory=cmake/ci ${TARGET}_test

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