Update ci.yml

Author: j5ik2o

.github/workflows/ci.yml

@@ -1,5 +1,6 @@
 name: CI
 on:
+  workflow_dispatch:
   push:
     branches:
       - main
@@ -58,7 +59,6 @@ jobs:
         with:
           java-version: ${{ matrix.jdk }}
       - uses: coursier/cache-action@v6
-      - uses: olafurpg/setup-gpg@v3
       - name: sbt test
         run: sbt -v ++${{ matrix.scala }} test
       - name: clean up