Move Docker image publishing to Publish job

[AlekSi]

golang-tip/.github/workflows/build.yml

Lines 48 to 64 in bd6b3b8

	# skip push for PRs
	# move to `publish` job
	# TODO https://github.com/AlekSi/golang-tip/issues/8
	- name: Login into Docker registries
	if: github.event_name != 'pull_request'
	run: |
	docker login --username aleksi --password ${{ secrets.DOCKERHUB_TOKEN }}
	docker login ghcr.io --username aleksi --password ${{ secrets.GITHUB_TOKEN }}
	- name: Upload Docker images
	if: github.event_name != 'pull_request'
	run: |
	docker tag golang-tip:${{ env.GO_BRANCH }} aleksi/golang-tip:${{ env.GO_BRANCH }}
	docker tag golang-tip:${{ env.GO_BRANCH }} ghcr.io/aleksi/golang-tip:${{ env.GO_BRANCH }}
	docker push aleksi/golang-tip:${{ env.GO_BRANCH }}
	docker push ghcr.io/aleksi/golang-tip:${{ env.GO_BRANCH }}