hermes+emacs: Add gleam lang and required tools

hosts/hermes/dev-home.nix

@@ -9,6 +9,11 @@
     jdt-language-server
     jetbrains.idea-community
     maven
+
+    # gleam
+    gleam
+    erlang
+    rebar3
   ];
 
   programs.java = {

modules/emacs/doom/config.org

@@ -188,6 +188,9 @@ Tangle ~packages.el~ from within org-mode.
            :repo "sogaiu/ajrepl"
            :files (:defaults ("ajrepl/"
                               "ajrepl/*"))))
+
+(package! gleam-mode
+  :recipe (:type git :host github :repo "gleam-lang/gleam-mode"))
 #+end_src
 * Modus-themes
 Customize Modus-themes a little to make it more peppy and vibrant.
@@ -857,6 +860,8 @@ mu4e + mbsync + msmtp:
   (delete '((java-mode java-ts-mode) "jdtls") eglot-server-programs)
   (add-to-list 'eglot-server-programs '((java-mode java-ts-mode) . ("jdt-language-server" "-config" "~/.cache/jdtls" "-data" ".jdtls-cache")))
 
+  (add-to-list 'eglot-server-programs '(gleam-mode . ("gleam" "lsp")))
+
   (setq! xref-show-xrefs-function #'consult-xref
          xref-show-definitions-function #'consult-xref
          eglot-send-changes-idle-time 0.2
@@ -1078,7 +1083,12 @@ When Emacs is opened in Windows Subsystem for Linux, open web links in Firefox o
   (breadcrumb-mode 1))
 #+end_src
 
-
+** Gleam
+#+begin_src emacs-lisp :lexical t
+(use-package! gleam-mode
+  :bind (:map gleam-mode-map
+              ("C-c g f" . gleam-format)))
+#+end_src
 ** Combobulate
 #+begin_src emacs-lisp :lexical t
 (use-package combobulate