Frontend-GNOME: remove --debug flag from launcher script

[knocte]

This would be making Smuxi much slower than it needs to; since many optimizations may not be enabled when running in debug mode.

If a developer wants to still run in debug mode after this, she still has two options:

a) Use make run which still launches smuxi with the --debug flag.

b) Export env var MONO_OPTIONS=--debug before launching smuxi.

[knocte]

@meebey thanks for merging so quickly, btw did you notice the red CI lanes? the Debian unstable one I'm aware of, but see the nix one? how could we fix that for newer PRs, restricting to github.ref values of 'master' and 'stable' for example?

[meebey]

@knocte thanks for raising. the unstable build failure is known because of Debian's GTK#2 removal. The nix build failure seems to have something to do that pulling this PR isn't working. Not sure why though, PR should be a regular branch that you can check out.

[meebey]

The GitHub action invokes:
pkgs.callPackage ./nix/default.nix { gitBranch = "${{ github.ref_name }}"; }'

github.ref_name is set by GitHub and is "300/merge" according to the build output.

Nix then attempts to fetch that branch via:

  src = fetchGit {
    url = "https://github.com/meebey/smuxi.git";
    ref = gitBranch;
    submodules = true;
  };

That call fails with:
fatal: couldn't find remote ref refs/heads/300/merge

Either 300/merge is not a valid branch ref of the github.com/meebey/smuxi git repo, or it doesn't like/cope with the "/" in the branch name.

[knocte]

Either 300/merge is not a valid branch ref of the github.com/meebey/smuxi git repo, or it doesn't like/cope with the "/" in the branch name.

In order to test your hypothesis above, I have pushed the same commit of this PR but to a new branch in my fork called "noDebug" (instead of "wip/noDebug", like I originally did; or if you look at it from the PR-CI point of view, "300/merge"), but CI is still broken, this time with this error: https://github.com/knocte/smuxi/actions/runs/8781811127/job/24094593528

Which I paste here:

Run nix-build --expr 'let pkgs = import <nixpkgs> { }; in pkgs.callPackage ./nix/default.nix { gitBranch = "noDebug"; }'
  nix-build --expr 'let pkgs = import <nixpkgs> { }; in pkgs.callPackage ./nix/default.nix { gitBranch = "noDebug"; }'
  shell: sh -e {0}
warning: $HOME ('/github/home') is not owned by you, falling back to the one defined in the 'passwd' file ('/root')
fatal: couldn't find remote ref refs/heads/noDebug
warning: could not update mtime for file '/root/.cache/nix/gitv3/0dlgrxhb3sw67bjmryck4mpsz6y189idaxg7vrcm45p[2](https://github.com/knocte/smuxi/actions/runs/8781811127/job/24094593528#step:4:2)vw1m665g/refs/heads/noDebug': No such file or directory
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:9:12:
            8|
            9|   strict = derivationStrict drvAttrs;
             |            ^
           10|

       … while evaluating derivation 'smuxi-1.2.1'
         whose name attribute is located at /nix/store/wj8[3](https://github.com/knocte/smuxi/actions/runs/8781811127/job/24094593528#step:4:3)y3qvj8v29d5zz0fih03682jf6qr1-b9zng82injl[4](https://github.com/knocte/smuxi/actions/runs/8781811127/job/24094593528#step:4:5)hg2cywz0ql8s9jiylnw0-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'src' of derivation 'smuxi-1.2.1'
         at /__w/smuxi/smuxi/nix/default.nix:24:3:
           23|
           24|   src = fetchGit {
             |   ^
           2[5](https://github.com/knocte/smuxi/actions/runs/8781811127/job/24094593528#step:4:6)|     url = "https://github.com/meebey/smuxi.git";

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: opening file '/root/.cache/nix/gitv3/0dlgrxhb3sw[6](https://github.com/knocte/smuxi/actions/runs/8781811127/job/24094593528#step:4:7)7bjmryck4mpsz6y189idaxg7vrcm45p2vw1m665g/refs/heads/noDebug': No such file or directory
Error: Process completed with exit code 1.

Is the real issue more clear now?