chore: add linux script

AppImageBuilder.yml

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+# appimage-builder recipe see https://appimage-builder.readthedocs.io for details
+version: 1
+AppDir:
+  path: AppDir
+  app_info:
+    id: org.localsend.localsend_app
+    name: LocalSend
+    icon: application-vnd.appimage
+    version: latest
+    exec: localsend_app
+    exec_args: $@
+  apt:
+    arch:
+    - amd64
+    allow_unauthenticated: true
+    sources:
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy main restricted
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy-updates main restricted
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy universe
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy-updates universe
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy multiverse
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy-updates multiverse
+      - sourceline: deb http://de.archive.ubuntu.com/ubuntu/ jammy-backports main restricted
+          universe multiverse
+      - sourceline: deb http://security.ubuntu.com/ubuntu jammy-security main restricted
+      - sourceline: deb http://security.ubuntu.com/ubuntu jammy-security universe
+      - sourceline: deb http://security.ubuntu.com/ubuntu jammy-security multiverse
+    include:
+      - libc6:amd64
+  files:
+    include: []
+    exclude:
+    - usr/share/man
+    - usr/share/doc/*/README.*
+    - usr/share/doc/*/changelog.*
+    - usr/share/doc/*/NEWS.*
+    - usr/share/doc/*/TODO.*
+  test:
+    fedora-30:
+      image: appimagecrafters/tests-env:fedora-30
+      command: ./AppRun
+    debian-stable:
+      image: appimagecrafters/tests-env:debian-stable
+      command: ./AppRun
+    archlinux-latest:
+      image: appimagecrafters/tests-env:archlinux-latest
+      command: ./AppRun
+    centos-7:
+      image: appimagecrafters/tests-env:centos-7
+      command: ./AppRun
+    ubuntu-xenial:
+      image: appimagecrafters/tests-env:ubuntu-xenial
+      command: ./AppRun
+AppImage:
+  arch: x86_64
+  update-information: guess

scripts/compile_linux_appbundle.sh

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+fvm flutter clean
+fvm flutter pub get
+fvm flutter pub run build_runner build -d
+fvm flutter build linux
+
+rm -rf AppDir
+rm -rf appimage-build
+
+mkdir AppDir
+cp -r build/linux/x64/release/bundle/* AppDir
+appimage-builder
+sudo chmod +x LocalSend-latest-x86_64.AppImage
+
+rm -rf AppDir
+rm -rf appimage-build