add a Github Actions workflow to push the dbdump image to GHCR #347

Job	Run time
fmt	14s
validate (envs/production)	20s
validate (envs/staging)	23s
validate (modules/api)	13s
validate (modules/cloudflare)	11s
validate (modules/dbdump)	9s
validate (modules/dbsetup)	17s
validate (modules/enmeshed)	13s
validate (modules/gcloud/cluster)	11s
validate (modules/gcloud/gcloud_dbdump_reader)	11s
validate (modules/gcloud/gcloud_dbdump_writer)	13s
validate (modules/gcloud/gcloud_mysql)	11s
validate (modules/gcloud/gcloud_postgres)	12s
validate (modules/hydra)	13s
validate (modules/ingress)	12s
validate (modules/ingress-nginx)	12s
validate (modules/kratos)	11s
validate (modules/redis)	9s
validate (modules/rocket-chat)	13s
validate (modules/tls-self-signed-cert)	10s
	4m 18s

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