Update add-to-project.yaml (#15)

Use shared GitHub workflow instead of duplicating it in each repo.

.github/workflows/add-to-project.yaml

@@ -10,19 +10,12 @@ on:
     types:
       - opened
       - reopened
+  issue_comment:
+    types:
+      - created
 
 jobs:
-  add-to-project:
-    name: Add issue to project
-    runs-on: ubuntu-latest
-    steps:
-      - name: Get GitHub app token
-        uses: actions/create-github-app-token@v1
-        id: app_token
-        with:
-          app-id: ${{ secrets.CONNECT_EXPORT_APP_ID }}
-          private-key: ${{ secrets.CONNECT_EXPORT_APP_KEY }}
-      - uses: actions/add-to-project@v0.5.0
-        with:
-          project-url: https://github.com/orgs/connectrpc/projects/1
-          github-token: ${{ steps.app_token.outputs.token }}
+  call-workflow-add-to-project:
+    name: Call workflow to add issue to project
+    uses: connectrpc/base-workflows/.github/workflows/add-to-project.yaml@main
+    secrets: inherit