CI: need the opam file

.github/workflows/deploy.yml

@@ -14,10 +14,6 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    defaults:
-      run:
-        working-directory: ./hello
-
     steps:
       - name: Checkout tree
         uses: actions/checkout@v4

jsoo-alhbed.opam

@@ -0,0 +1,33 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "A short synopsis"
+description: "A longer description"
+maintainer: ["Yoshihiro Imai"]
+authors: ["Yoshihiro Imai"]
+license: "LICENSE"
+tags: ["topics" "to describe" "your" "project"]
+homepage: "https://github.com/username/reponame"
+doc: "https://url/to/documentation"
+bug-reports: "https://github.com/username/reponame/issues"
+depends: [
+  "ocaml"
+  "dune" {>= "3.0"}
+  "js_of_ocaml-ppx"
+  "uutf"
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/username/reponame.git"