How to update Debian package

Let's first set key parameters

If you have salsa account, use SSH URL.
```
 $ GIT_SALSA_URL="git@salsa.debian.org:debian/caps2esc.git"
```

If you don't have salsa account, use HTTPS URL.
```
 $ GIT_SALSA_URL="https://salsa.debian.org/debian/debian/caps2esc.git"
```

For upstream URL and branch to track, use HTTPS URL..
```
 $ HTTPS_UPSTREAM_URL="https://gitlab.com/interception/linux/plugins/caps2esc.git"
```

Debian packaging uses debian/latest branch following DEP-14.
 https://dep-team.pages.debian.net/deps/dep14/

Create and update package as follows:

```
 $ git clone $GIT_SALSA_URL
 $ git remote add upstream $HTTPS_UPSTREAM_URL
 $ git remote set-url --push upstream DONT_PUSH
 $ git pull --no-rebase upstream master
 $ git pull --no-rebase upstream --tags
  ... hack (set debian/changelog with the latest version)
 $ git deborig
 $ sbuild # test build
  ...
```

Here, sbuild needs to be configured properly.
See https://www.debian.org/doc/manuals/debmake-doc/ch03.en.html#sbuild-setup

Initial upload needs to be source+binary.  So this config needs adjustment.

In future upload (source only), I may use dgit.

```
 $ dgit sbuild
 $ dgit push-source
 $ git push
```

