Fix broken make deb-from-pypi (switch to GH releases) (#12)

PyPI no longer serves PGP signatures:
```
uscan info: Downloading OpenPGP signature from:
   https://pypi.debian.net/afancontrol/afancontrol-3.1.0.tar.gz.asc (pgpsigurlmangled)
   as afancontrol-3.1.0.tar.gz.asc
uscan info: Requesting URL:
   https://pypi.debian.net/afancontrol/afancontrol-3.1.0.tar.gz.asc
uscan warn: In directory ., downloading
  https://pypi.debian.net/afancontrol/afancontrol-3.1.0.tar.gz.asc failed: 404 NOT FOUND
uscan die: FAIL Checking OpenPGP signature (no signature file downloaded).
```

Makefile

@@ -62,7 +62,10 @@ deb-local: clean sdist
 	'
 
 .PHONY: deb-from-pypi
-deb-from-pypi: clean
+deb-from-pypi: deb-from-github  # deprecated target
+
+.PHONY: deb-from-github
+deb-from-github: clean
 	docker build -t afancontrol-debuild -f ./Dockerfile.debian .
 	docker run -it --rm \
 		-v `pwd`/dist:/afancontrol/dist \

RELEASE.md

@@ -7,9 +7,11 @@
 1. `make release`
 1. `git tag -s 3.0.0` + `git push origin 3.0.0`
 1. Create a new release for the pushed tag at https://github.com/KostyaEsmukov/afancontrol/releases
+1. Upload a GPG signature of the tarball to the just created GitHub release,
+   see https://wiki.debian.org/Creating%20signed%20GitHub%20releases
 
 ## Check
 
-1. `make deb-from-pypi`
+1. `make deb-from-github`
 1. `docker run -it --rm python:3.7 bash` + `pip install afancontrol` + `afancontrol --help`
 1. Ensure that the CI build for the tag is green.

debian/watch

@@ -1,3 +1,7 @@
-version=3
-opts=uversionmangle=s/(rc|a|b|c)/~$1/,pgpsigurlmangle=s/$/.asc/ \
-https://pypi.debian.net/afancontrol/afancontrol-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))
+version=4
+opts="repack,compression=gz,repacksuffix=+dfsg,dversionmangle=s/\+dfsg//,\
+uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha)\d*)$/$1~$2/,\
+pgpsigurlmangle=s@archive/refs/tags@releases/download@;\
+s@([^\/]+)\.tar\.gz@$1/afancontrol-$1\.tar\.gz@;\
+s/$/.asc/" \
+  https://github.com/KostyaEsmukov/afancontrol/tags .*/v?(\d\.\d\.\d[a-z]?)\.tar\.gz

docs/index.rst

@@ -217,7 +217,7 @@ There's a Dockerfile which can be used to build a Debian `.deb` package:
     # Build the .deb from the latest PyPI release:
     git clone https://github.com/KostyaEsmukov/afancontrol.git
     cd afancontrol
-    make deb-from-pypi
+    make deb-from-github
 
     # Install the package:
     sudo apt install ./dist/debian/*.deb