Update linux-arm.yml #470

	name: Linux ARM (Docker)

	on:
	pull_request:
	types: [synchronize, opened]
	push:
	branches:
	- main

	env:
	DEBIAN_FRONTEND: noninteractive
	OPENCV_VERSION: 4.12.0

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: docker/setup-qemu-action@v3

	- uses: docker/setup-buildx-action@v3
	with:
	install: true

	# Build with Buildx and cache Docker layers in GitHub Actions cache
	- name: Build with Docker (cached)
	uses: docker/build-push-action@v6
	with:
	context: ./docker/ubuntu24-dotnet8-opencv4.12.0
	platforms: linux/arm/v7
	build-args: \|
	OPENCV_VERSION=${{ env.OPENCV_VERSION }}
	# Load the built image to local Docker for later docker create/cp
	outputs: type=docker,name=opencvsharp-linux-arm:latest
	cache-from: type=gha
	cache-to: type=gha,mode=max

	- name: Extract build files from Docker instance
	run: \|
	docker create -ti --name opencvsharp-linux-arm-tmp opencvsharp-linux-arm bash
	docker cp opencvsharp-linux-arm-tmp:/artifacts .

	- name: Patch nuspec with version and build NuGet package
	run: \|
	sed -E --in-place=.bak "s/<version>[0-9]\.[0-9]{1,2}\.[0-9]{1,2}.[0-9]{8}(-beta[0-9]*)?<\/version>/<version>${OPENCV_VERSION}.$(date '+%Y%m%d')<\/version>/" nuget/OpenCvSharp4.runtime.linux-arm.nuspec
	cp artifacts/libOpenCvSharpExtern.so nuget/
	dotnet pack nuget/OpenCvSharp4.runtime.linux-arm.csproj -o artifacts_arm

	- uses: actions/upload-artifact@v4
	with:
	name: artifacts_linux_arm
	path: artifacts_arm

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