Add riscv toolchain build workflow #1

	name: riscv-gnu-toolchain-build

	on:
	workflow_dispatch:
	push:
	paths:
	- containers/whisper/**
	- .github/workflows/riscv-gnu-toolchain-build.yml # Self-trigger

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: bouncmpe/riscv-gnu-toolchain

	jobs:
	build:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true
	strategy:
	fail-fast: false
	matrix:
	platform:
	- linux/amd64
	- linux/arm64

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	- name: Docker meta
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Log in to the registry
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build and push Docker image
	uses: docker/build-push-action@v5
	with:
	context: containers/riscv-gnu-toolchain
	platforms: ${{ matrix.platform }}
	push: true
	tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
	labels: ${{ steps.meta.outputs.labels }}
	build-args: \|
	"RISCV_ARCH=rv32im"
	"RISCV_ABI=ilp32"
	cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache
	cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache,mode=max

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