flatpak: remove references to systemd unit

Replaces #7676

When building as a flatpak, don't install the systemd user services
since flatpaks can't use them. Remove references to the systemd service
from the DBus service.

Also, customize the app metadata depending on the debug mode.

Co-authored-by: Leorize <leorize+oss@disroot.org>

dist/linux/com.mitchellh.ghostty.metainfo.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <component type="desktop-application">
-  <id>com.mitchellh.ghostty</id>
+  <id>com.mitchellh.ghostty@@DEBUG@@</id>
-  <launchable type="desktop-id">com.mitchellh.ghostty.desktop</launchable>
+  <launchable type="desktop-id">com.mitchellh.ghostty@@DEBUG@@.desktop</launchable>
   <name>Ghostty</name>
   <url type="homepage">https://ghostty.org</url>
   <url type="help">https://ghostty.org/docs</url>

flatpak/com.mitchellh.ghostty-debug.yml

@@ -6,11 +6,7 @@ sdk-extensions:
   - org.freedesktop.Sdk.Extension.ziglang
 default-branch: tip
 command: ghostty
-# Integrate the rename into zig build, maybe?
-rename-desktop-file: com.mitchellh.ghostty.desktop
-rename-appdata-file: com.mitchellh.ghostty.metainfo.xml
 rename-icon: com.mitchellh.ghostty
-desktop-file-name-suffix: " (Debug)"
 finish-args:
   # 3D rendering
   - --device=dri

src/build/GhosttyResources.zig

@@ -258,6 +258,7 @@ pub fn init(b: *std.Build, cfg: *const Config) !GhosttyResources {
             ),
         );
         // systemd user service
+        if (!cfg.flatpak)
             try steps.append(
                 formatService(
                     b,
@@ -277,10 +278,22 @@ pub fn init(b: *std.Build, cfg: *const Config) !GhosttyResources {
             );
 
         // AppStream metainfo so that application has rich metadata within app stores
-        try steps.append(&b.addInstallFile(
+        try steps.append(
+            formatService(
+                b,
+                cfg,
                 b.path("dist/linux/com.mitchellh.ghostty.metainfo.xml"),
-            "share/metainfo/com.mitchellh.ghostty.metainfo.xml",
+                b.fmt(
-        ).step);
+                    "share/metainfo/com.mitchellh.ghostty{s}.metainfo.xml",
+                    .{
+                        switch (cfg.optimize) {
+                            .Debug, .ReleaseSafe => "-debug",
+                            .ReleaseFast, .ReleaseSmall => "",
+                        },
+                    },
+                ),
+            ),
+        );
 
         // Right click menu action for Plasma desktop
         try steps.append(&b.addInstallFile(
@@ -360,7 +373,7 @@ pub fn formatService(b: *std.Build, cfg: *const Config, src: std.Build.LazyPath,
         "-e s!@@NAME@@!{s}!g",
         .{
             switch (cfg.optimize) {
-                .Debug, .ReleaseSafe => " Debug",
+                .Debug, .ReleaseSafe => " (Debug)",
                 .ReleaseFast, .ReleaseSmall => "",
             },
         },
@@ -378,6 +391,8 @@ pub fn formatService(b: *std.Build, cfg: *const Config, src: std.Build.LazyPath,
         "-e s!@@GHOSTTY@@!{s}/bin/ghostty!g",
         .{b.install_prefix},
     ));
+    if (cfg.flatpak)
+        cmd.addArg("-e /^SystemdService=/d");
 
     return &b.addInstallFile(output, dest).step;
 }