add dev env packages to depends

.envrc

@@ -1 +1 @@
-eval $(opam config env)
+eval $(opam env --switch=.)

.gitignore

@@ -1,2 +1,3 @@
 .DS_Store
 _build/
+_opam/

aoc.opam

@@ -12,6 +12,9 @@ bug-reports: "https://github.com/username/reponame/issues"
 depends: [
   "ocaml"
   "dune" {>= "3.10"}
+  "utop"
+  "ocaml-lsp-server"
+  "ocamlformat"
   "re"
   "containers"
   "iter"

dune-project

@@ -22,6 +22,12 @@
  (synopsis "A short synopsis")
  (description "A longer description")
  (depends
+   ;; development env
+   utop
+   ocaml-lsp-server
+   ocamlformat
+
+   ;; deps
    ocaml
    dune
    re
@@ -29,11 +35,14 @@
    iter
    dune-site
    angstrom
+
+   ;; ppx
    ppx_deriving
    ppx_deriving_hash
    ppx_regexp
    ppx_expect
-   ppx_inline_test)
+   ppx_inline_test
+ )
  (sites (lib inputs))
  (tags
   (topics "to describe" your project)))