add docker sig for 21.1.1 #9

	name: Verify and Upload Signatures to Docker Hub

	on:
	push:
	branches:
	- master # Adjust the branch as necessary

	jobs:
	verify-and-upload-sigs:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v2

	- name: Set up Cosign
	run: \|
	COSIGN_VERSION=$(curl -s https://api.github.com/repos/sigstore/cosign/releases/latest \| jq -r .tag_name)
	curl -LO "https://github.com/sigstore/cosign/releases/download/${COSIGN_VERSION}/cosign-linux-amd64"
	chmod +x cosign-linux-amd64
	sudo mv cosign-linux-amd64 /usr/local/bin/cosign

	- name: Login to DockerHub
	uses: docker/login-action@v2
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Verify and attach signatures to Docker images
	run: \|
	sig_dir="dashd" # Adjust this to your specific directory
	pub_key="dashd/dashd.pub" # Adjust this to your public key
	for sigfile in $(find $sig_dir -name '*.cosig'); do
	digest=$(basename $sigfile .cosig)
	image="dashpay/dashd@sha256:$digest"
	# Verify the signature
	cosign verify --key $pub_key --signature $sigfile $image && \
	# Attach the signature if verification is successful
	cosign attach signature --signature $sigfile $image
	done

Provide feedback