Conditionally build and push container images #1

	# Copyright 2024 The Cross-Media Measurement Authors
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
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	# distributed under the License is distributed on an "AS IS" BASIS,
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	name: Conditionally build and push container images

	on:
	workflow_dispatch:
	workflow_call:
	inputs:
	existing-image-tag:
	description: "Tag of existing published container images"
	type: string
	outputs:
	image-tag:
	description: "Tag of container images"
	value: ${{ jobs.get-image-tag.outputs.image-tag }}

	jobs:
	get-image-tag:
	runs-on: ubuntu-22.04
	outputs:
	image-tag: ${{ steps.get-image-tag.outputs.image-tag }}
	steps:
	- id: get-image-tag
	name: Get image tag
	env:
	EXISTING_IMAGE_TAG: ${{ inputs.existing-image-tag }}
	run: \|
	declare image_tag
	if [[ -n "$EXISTING_IMAGE_TAG" ]]; then
	image_tag="$EXISTING_IMAGE_TAG"
	elif [[ "$GITHUB_REF_TYPE" == 'tag' ]]; then
	image_tag="${GITHUB_REF_NAME#v}"
	else
	image_tag="$GITHUB_SHA"
	fi
	echo "image-tag=${image_tag}" >> "$GITHUB_OUTPUT"
	push-images:
	uses: ./.github/workflows/push-images.yml
	if: inputs.existing-image-tag == ''
	needs: [get-image-tag]
	with:
	image-tag: ${{ needs.get-image-tag.outputs.image-tag }}

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