dget -xu https://launchpad.net/~snappy-dev/+archive/ubuntu/image/+files/snapd_2.22.5.dsc
sed -i 's/.*\(DEB_BUILD_OPTIONS=\)\(.*\)/\1"\2 testkeys"/' snapd*/debian/rules
cd snapd-*/
dch -ltestkeys "Build with testkeys"
dch -r 'Release with test keys'
debuild -S -sd
cd -
dput ppa:jibel/ppa snapd_*testkey*_source.changes