Add workflow to synchronize go mod changes with submodules #760

	# Copyright 2023 The Sigstore Authors.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
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	# http://www.apache.org/licenses/LICENSE-2.0
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	name: Conformance Tests

	on:
	workflow_dispatch:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	permissions:
	contents: read

	jobs:
	conformance:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
	- uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
	with:
	go-version-file: go.mod

	- run: go mod download

	- run: go build -o conformance cmd/conformance/main.go

	- uses: sigstore/sigstore-conformance@ee4de0e602873beed74cf9e49d5332529fe69bf6 # v0.0.11
	with:
	entrypoint: ${{ github.workspace }}/conformance

	- uses: sigstore/sigstore-conformance@ee4de0e602873beed74cf9e49d5332529fe69bf6 # v0.0.11
	with:
	entrypoint: ${{ github.workspace }}/conformance
	environment: staging

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