Merge branch 'unstable' of github.com:openrocket/openrocket into unstable

SUPPORT.md

@@ -5,8 +5,12 @@ OpenRocket has two main Wiki-pages for documentation:
 * [OpenRocket wiki](http://wiki.openrocket.info/Main_Page)
 * [OpenRocket website](https://openrocket.info/index.html)
 
+Also check out our tutorials to get you going on OpenRocket:
+* [OpenRocket tutorials](https://openrocket.info/tutorials/)
+
 Our main communication channel are:
-* [Slack](https://www.rocketryforum.com/forums/rocketry-electronics-software.36/) = **primary communication channel**
+* [Discord](https://discord.gg/qD2G5v2FAw) = **primary communication channel**
 * [OpenRocket forum](https://www.rocketryforum.com/forums/rocketry-electronics-software.36/)
 * [OpenRocket-devel mailing list](https://sourceforge.net/projects/openrocket/lists/openrocket-devel) for discussion related to OpenRocket development, documentation and upcoming features
 * [OpenRocket-announce mailing list](https://sourceforge.net/projects/openrocket/lists/openrocket-announce) for announcements of new OpenRocket versions and developments
+* [OpenRocket-website](https://lists.sourceforge.net/lists/listinfo/openrocket-website) for discussions around our website ([openrocket.info](openrocket.info))

snap/snapcraft.yaml

@@ -30,7 +30,11 @@ plugs:
 
 architectures:
   - build-on: [amd64]
-    build-for: [all]
+  - build-on: [arm64]
+  - build-on: [armhf]
+  - build-on: [ppc64el]
+  - build-on: [s390x]
+  - build-on: [i386]
 
 apps:
   openrocket: