Fix esy workflow

Author: Julow

.github/workflows/build.yml

@@ -94,4 +94,4 @@ jobs:
         run: esy install --verbose
 
       - name: Build odoc
-        run: esy x dune exec src/odoc/bin/main.exe -- --version
+        run: esy x odoc --version

package.json

@@ -9,7 +9,7 @@
     "Leo White <[email protected]>"
   ],
   "esy": {
-    "build": "dune build",
+    "build": "dune build -p odoc",
     "release": {
       "releasedBinaries": [
         "odoc"