Use .NET 8 docker building tooling

[bruno-garcia]

There's a lot of yml dealing with building the docker images:

nuget-trends/.github/workflows/scheduler-workflow.yml

Lines 36 to 66 in b4fbc34

	- name: Prepare Docker
	id: docker-prep
	run: |
	DOCKER_IMAGE=nugettrends/nugettrends.scheduler
	VERSION=noop
	ENVIRONMENT=test
	if [[ $GITHUB_REF == refs/tags/* ]]; then
	VERSION=${GITHUB_REF#refs/tags/}
	ENVIRONMENT=prod
	elif [[ $GITHUB_REF == refs/heads/main ]]; then
	VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
	fi
	TAGS="${DOCKER_IMAGE}:${VERSION}"
	if [[ $VERSION =~ ^v[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
	MINOR=${VERSION%.*}
	MAJOR=${MINOR%.*}
	TAGS="$TAGS,${DOCKER_IMAGE}:${MINOR},${DOCKER_IMAGE}:${MAJOR},${DOCKER_IMAGE}:latest"
	elif [ "${{ github.event_name }}" = "push" ]; then
	TAGS="$TAGS,${DOCKER_IMAGE}:sha-${GITHUB_SHA::8}"
	fi
	echo ::set-output name=environment::${ENVIRONMENT}
	echo ::set-output name=version::${VERSION}
	echo ::set-output name=tags::${TAGS}
	echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
	- name: Docker values debug
	run: |
	echo ${{ steps.docker-prep.outputs.environment }}
	echo ${{ steps.docker-prep.outputs.version }}
	echo ${{ steps.docker-prep.outputs.tags }}
	echo ${{ steps.docker-prep.outputs.created }}

.NET8 has this stuff built in

See: https://laurentkempe.com/2023/10/30/publish-dotnet-docker-images-using-dotnet-sdk-and-github-actions/

[bruno-garcia]

This will break soon because:

 Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/