packages/forgejo: init with patches

packages/patched-derivations.nix

@@ -51,6 +51,8 @@ super: rec {
 
   dvc-objects = super.python3Packages.dvc-objects.overrideAttrs dvcMd5ToSha256;
 
+  forgejo = patch super.forgejo "patches/base/forgejo";
+
   jellyfin = patch (super.jellyfin.override {
     ffmpeg = super.ffmpeg.override {
       withMfx = true;

patches/base/forgejo/oauth2-secret-from-env.patch

@@ -0,0 +1,12 @@
+diff --git a/cmd/admin.go b/cmd/admin.go
+index f9fb1b6c6..2725b1f1c 100644
+--- a/cmd/admin.go
++++ b/cmd/admin.go
+@@ -151,6 +151,7 @@ var (
+ 			Name:  "secret",
+ 			Value: "",
+ 			Usage: "Client Secret",
++			EnvVar: "FORGEJO_ADMIN_OAUTH2_SECRET",
+ 		},
+ 		cli.StringFlag{
+ 			Name:  "auto-discover-url",