package: introduce .deb packaging

[dumbmoron]

fixes #47

[greptile-apps]

_{Last reviewed commit: 8ce2b1e}

[dumbmoron]

@greptileai

[greptile-apps]

_{Last reviewed commit: 202bed2}

[dumbmoron]

@greptileai

[greptile-apps]

_{Last reviewed commit: 2273dac}

[dumbmoron]

@greptileai

[greptile-apps]

_{Last reviewed commit: 2dae649}

[alyx161]

@dumbmoron Isn't this a duplicate of my PR #181 ?

[dumbmoron]

yes, i'd prefer not to use fpm

[alyx161]

because?

[dumbmoron]

because the specfile already defines what we want to do with the tarball well and i would like to use it as the source of truth for both outputs