linux-rust: add just file to build appimage

linux-rust/Justfile

@@ -0,0 +1,52 @@
+APP_NAME := "librepods-rust"
+DESKTOP_FILE := "assets/me.kavishdevar.librepods.desktop"
+ICON_FILE := "assets/icon.png"
+
+default: build-appimage
+
+build:
+    cargo build --release
+
+prepare:
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    tmpdir="$(mktemp -d)"
+    echo "Building AppDir in: $tmpdir"
+
+    mkdir -p "$tmpdir/usr/bin"
+    mkdir -p "$tmpdir/usr/share/applications"
+    mkdir -p "$tmpdir/usr/share/icons/hicolor/256x256/apps"
+
+    cp target/release/{{APP_NAME}} "$tmpdir/usr/bin/"
+    cp assets/icon.png "$tmpdir/usr/share/icons/hicolor/256x256/apps/librepods-icon.png"
+    cp {{DESKTOP_FILE}} "$tmpdir/{{APP_NAME}}.desktop"
+
+    printf '%s\n' \
+        '#!/bin/bash' \
+        'HERE="$(dirname "$(readlink -f "$0")")"' \
+        'exec "$HERE/usr/bin/librepods-rust" "$@"' \
+        > "$tmpdir/AppRun"
+
+    chmod +x "$tmpdir/AppRun"
+    echo "$tmpdir" > .appdir_path
+
+bundle:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    tmpdir="$(cat .appdir_path)"
+
+    linuxdeploy \
+        --appdir "$tmpdir" \
+        --executable "$tmpdir/usr/bin/{{APP_NAME}}" \
+        --desktop-file "$tmpdir/{{APP_NAME}}.desktop" \
+        --icon-file "$tmpdir/usr/share/icons/hicolor/256x256/apps/librepods-icon.png"
+
+build-appimage: build prepare bundle
+    #!/usr/bin/env bash
+    set -euo pipefail
+    tmpdir="$(cat .appdir_path)"
+    mkdir -p dist
+    appimagetool "$tmpdir" "dist/LibrePods-x86_64.AppImage"
+    rm -rf "$tmpdir" .appdir_path
+    echo "Done!"