Publish PPA automatically

[fujiapple852]

Inspired by:

https://github.com/yuezk/publish-ppa-package/blob/main/build.sh

This script needs to be updated to reflect the cargo vendoring step needed (see https://github.com/fujiapple852/trippy/blob/master/debian/README.debian).

Note that this script is able to publish for all supported Ubuntu versions.

[fujiapple852]

Step (roughyl) to publish manually (for 0.10.0 on Jammy):

docker run -it -v (pwd):/data ubuntu:jammy

apt update && apt install build-essential devscripts debhelper cargo wget

cd /data

wget https://github.com/fujiapple852/trippy/archive/refs/tags/0.10.0.tar.gz
mv 0.10.0.tar.gz.1 trippy_0.10.0.orig.tar.gz

mkdir build
mv debian build
cd build

# build vendored dep crates
./debian/rules vendor

# setup gpg and import launchpad key pair
# gpg --import ...

# build PPA source package
debuild --prepend-path ~/.cargo/bin -S -sa

# publish to launchpad
dput ppa:fujiapple/trippy ../trippy_0.10.0-1ubuntu0.1~jammy1_source.changes