add error handling for missing public key #4

	name: build and publish container non develop branches

	on:
	push:
	branches:
	- '*'
	- '!develop'
	env:
	DOCKER_HUB_ORGANIZATION: ${{ vars.DOCKER_HUB_ORGANIZATION }}
	DOCKER_HUB_REPOSITORY: opey


	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- name: Extract branch name
	shell: bash
	run: echo "branch=$(echo ${GITHUB_REF#refs/heads/})" >>$GITHUB_OUTPUT
	id: extract_branch

	- uses: actions/checkout@v4
	- name: Build the Docker image
	run: \|
	echo "${{ secrets.DOCKER_HUB_TOKEN }}" \| docker login -u "${{ secrets.DOCKER_HUB_USERNAME }}" --password-stdin docker.io
	docker build . --file Dockerfile --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:$GITHUB_SHA --tag docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:${{ steps.extract_branch.outputs.branch }}
	docker push docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }} --all-tags
	echo docker opey done
	- uses: sigstore/cosign-installer@main
	- name: Write signing key to disk (only needed for `cosign sign --key`)
	run: echo "${{ secrets.COSIGN_PRIVATE_KEY }}" > cosign.key
	- name: Sign container image with annotations from our environment
	env:
	COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
	run: \|
	cosign sign -y --key cosign.key \
	-a "repo=${{ github.repository }}" \
	-a "workflow=${{ github.workflow }}" \
	-a "ref=${{ github.sha }}" \
	docker.io/${{ env.DOCKER_HUB_ORGANIZATION }}/${{ env.DOCKER_HUB_REPOSITORY }}:${{ steps.extract_branch.outputs.branch }}

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