oohelperd packaging and CI (#374)

Closes https://github.com/ooni/backend/issues/499

Co-authored-by: Simone Basso <bassosimone@gmail.com>

internal/cmd/oohelperd/debian/control

@@ -0,0 +1,22 @@
+Source: oohelperd
+Maintainer: Federico Ceratto <federico@openobservatory.org>
+Section: devel
+Priority: optional
+Build-Depends:
+ devscripts,
+ dpkg-dev,
+Standards-Version: 4.5.0
+Vcs-Browser: https://github.com/ooni/probe-cli
+Vcs-Git: https://github.com/ooni/probe-cli.git
+Homepage: https://github.com/ooni/probe-cli
+Rules-Requires-Root: no
+XS-Go-Import-Path: github.com/ooni/probe-cli
+
+Package: oohelperd
+Architecture: any
+Pre-Depends: debconf (>= 1.0.0)
+Depends: ${misc:Depends}, ${shlibs:Depends},
+ adduser,
+ debconf
+Built-Using: ${misc:Built-Using}
+Description: OONI test helper