docs: add instructions for deb source package and uploading to ppa

docs/build-ppa.md

+# PPA How to
+
+LEAP team maintains a [ppa repository](https://launchpad.net/~leapcodes) for the clients, pacakges are built for latest two LTS releases of ubuntu
+
+## Pre-requisites
+
+Ensure that all the build dependencies are already installed, you can use `make depends` on most ubuntu and debian version to have the machine
+ready to build `bitmask-vpn` debian packages
+
+If `make depends` do not work, it is useful to have the `devscripts` and `equivs` packages installed, these are needed later for building
+the source package and installing build dependencies.
+
+PPA expects a signed source package, we have to build this package and then upload to PPA the changes file using the [`dput`](https://manpages.ubuntu.com/manpages/xenial/man1/dput.1.html) tool.
+
+Please refer to official [PPA documentation](https://help.launchpad.net/Packaging/PPA) for how to create an account and add SSH and GPG keys to be able to upload.
+
+## Build signed source package
+
+### Prepare the debian package from templates
+
+```
+$ export PROVIDER=riseup # can be riseup, bitmask or calyx
+$ make vendor
+$ BUILD_RELEASE=yes make prepare_deb
+```
+
+> **NOTE**: The above commands will generate a debian directory in `build/riseup/debian` the control file created there can be used to build a dependencies package
+
+* If build depends are not yet installed, build a dependencies package with all the build and runtime dependencies of `bitmask-vpn`:
+
+```
+$ cd build/riseup/debian
+$ mk-build-deps control
+$ apt-get install -f ./riseup-vpn-build-deps_0.24.8_all.deb
+```
+
+* Add changes to changelog by copying the entries from the `CHANGELOG` file at the root of the repo
+
+```
+# example changelog file for 0.24.8 might look like
+$ cd build/riseup/build/riseup-vpn_0.24.8/
+$ cat debian/changelog
+riseup-vpn (0.24.8~noble) noble; urgency=medium
+  * Reduces the size of splash screen image
+  * Disable obfs4 and kcp checkbox in preferences for riseup
+  * Removes duplicate languages in the language picker in preferences
+  * Language picker in preferences shows languages sorted alphabetically
+  * 0.24.8 ubuntu noble release
+
+ -- LEAP Encryption Access Project <debian@leap.se>  Thu, 05 Sep 2024 03:06:54 +0800
+
+riseup-vpn (0.24.8-6-g92db03c4) unstable; urgency=medium
+
+  * Initial package.
+
+ -- LEAP Encryption Access Project  <debian@leap.se>  Mon, 29 Jul 2019 10:00:00 +0100
+
+```
+
+* Bump native dot-version, change release
+
+```
+$ cd build/riseup/build/riseup-vpn_0.24.8
+# to add a new entry for version 0.24.8 to the changelog file and update the release
+$ dch -b -v 0.24.8~noble -D "noble" -m "riseup-vpn release 0.24.8"
+```
+
+> **NOTE:** The source tarball's name as set by the `make preapre_deb` step will not match the version we set in the changelog file, since
+for PPAs we need to append the distribution name to the version, e.g to build `0.24.8` for `noble` the version is `0.24.8~noble`
+> More details about versioning ppa can be found in the PPA docs [versioning section](https://help.launchpad.net/Packaging/PPA/BuildingASourcePackage#versioning)
+
+* We need to rename the source tarball to match the version we set in the `changelog` file:
+
+```
+$ cd build/riseup/build
+$ mv riseup-vpn_0.24.8.orig.tar.gz riseup-vpn_0.24.8~noble.orig.tar.gz
+```
+
+### Build signed source package
+
+```
+$ cd build/riseup/build/riseup-vpn_0.24.8
+$ debuild -S -k=<key_id_for_signing>
+```
+
+### Upload changes file
+
+```
+$ cd build/riseup/build
+$ dput ppa:leapcodes/ppa riseup-vpn_0.24.8~noble_source.changes
+```

docs/build-ppa.rst

-ppa howto
-=========
-
-* Add changes to changelog (bump native dot-version, change release)
-* Upload changes file
-
-.. code:: bash
-
-  debuild -i -S
-  dput --force ppa:kalikaneko/ppa ../riseup-vpn_0.21.2.2_source.changes
-
-Using kali's ppa
-----------------
-
-.. code:: bash
-
-  sudo gpg --homedir=/tmp --no-default-keyring --keyring /usr/share/keyrings/kali-ppa-archive-keyring.gpg --keyserver keyserver.ubuntu.com --recv-keys 0xbe23fb4a0e9db36ecb9ab8be23638bf72c593bc1
-  sudo add-apt-repository ppa:kalikaneko/ppa
-  sudo apt update
-  sudo apt install riseup-vpn
-