adds STAGING_SKIP_TAGS to snapci script
adds STAGING_SKIP_TAGS to snapci script

ehartsuyker/securedrop,chadmiller/securedrop,conorsch/securedrop,kelcecil/securedrop,jaseg/securedrop,heartsucker/securedrop,pwplus/securedrop,conorsch/securedrop,micahflee/securedrop,chadmiller/securedrop,ehartsuyker/securedrop,pwplus/securedrop,garrettr/securedrop,jaseg/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,jrosco/securedrop,kelcecil/securedrop,pwplus/securedrop,conorsch/securedrop,ageis/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,jaseg/securedrop,heartsucker/securedrop,conorsch/securedrop,jrosco/securedrop,kelcecil/securedrop,ehartsuyker/securedrop,garrettr/securedrop,jaseg/securedrop,jrosco/securedrop,pwplus/securedrop,chadmiller/securedrop,jaseg/securedrop,jrosco/securedrop,heartsucker/securedrop,ageis/securedrop,ageis/securedrop,conorsch/securedrop,garrettr/securedrop,ageis/securedrop,chadmiller/securedrop,chadmiller/securedrop,jrosco/securedrop,micahflee/securedrop,kelcecil/securedrop,chadmiller/securedrop,jrosco/securedrop,garrettr/securedrop,pwplus/securedrop,ehartsuyker/securedrop,micahflee/securedrop,micahflee/securedrop,jaseg/securedrop,kelcecil/securedrop,pwplus/securedrop,kelcecil/securedrop