Add changelog for v3.0.3 (#4572) #1639

	# Copyright 2024 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.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
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	name: Conformance Tests

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

	permissions:
	contents: read

	jobs:
	conformance:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
	with:
	persist-credentials: false

	- name: Extract version of Go to use
	run: echo "GOVERSION=$(awk -F'[:@]' '/FROM golang/{print $2; exit}' Dockerfile)" >> $GITHUB_ENV

	- uses: actions/setup-go@4dc6199c7b1a012772edbd06daecab0f50c9053c # v6.1.0
	with:
	go-version: '${{ env.GOVERSION }}'
	check-latest: true
	cache: false

	- run: make cosign conformance

	- uses: sigstore/sigstore-conformance@b7856cfca56fe3f957d4cefdc2c359cc36a84e14 # v0.0.24
	with:
	entrypoint: ${{ github.workspace }}/conformance

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