Switch to new download format and update source.sh script

pkg.info

@@ -1,10 +1,29 @@
 name: river
 description: A dynamic tiling Wayland compositor
 version: 0.3.12
+revision: 2
 url: https://codeberg.org/river/river
 license: GPL3-only
 architecture: any
-depends: ["glibc","libevdev","libinput","libxkbcommon","mesa","pixman","wayland","wlroots","xorg-xwayland"]
-optional_depends: ["polkit"]
-make_depends: ["scdoc","wayland-protocols","zig"]
 type: source
+depends:
+  - glibc
+  - libevdev
+  - libinput
+  - libxkbcommon
+  - mesa
+  - pixman
+  - wayland
+  - wlroots
+  - xorg-xwayland
+optional_depends:
+  - polkit
+make_depends:
+  - scdoc
+  - wayland-protocols
+  - zig
+downloads:
+  - url: https://codeberg.org/river/river/releases/download/v${BPM_PKG_VERSION}/river-${BPM_PKG_VERSION}.tar.gz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: 06376cc7b38eb2307030f7ec0954db119d83c55a5226abe4c363c2dbec6f40c3