removed arm build, added appimage build to CI

configs/AppImageBuilder_arm64.yml

@@ -1,26 +0,0 @@
-# appimage-builder recipe see https://appimage-builder.readthedocs.io for details
-version: 1
-script:
-  - rm -rf AppDir | true
-  - cp -r build/linux/arm64/release/bundle AppDir
-  - mkdir -p AppDir/usr/share/icons/hicolor/64x64/apps/
-  - cp configs/prodIcon.png AppDir/usr/share/icons/hicolor/64x64/apps/
-AppDir:
-  path: ./AppDir
-  app_info:
-    id: net.inaph.prod
-    name: Prod
-    icon: prodIcon
-    version: latest
-    exec: prod
-    exec_args: $@
-  files:
-    exclude:
-      - usr/share/man
-      - usr/share/doc/*/README.*
-      - usr/share/doc/*/changelog.*
-      - usr/share/doc/*/NEWS.*
-      - usr/share/doc/*/TODO.*
-AppImage:
-  arch: arm64
-  update-information: guess