Add auto-assign dapr_bot workflow (#654)

.github/workflows/dapr_bot.yml

@@ -0,0 +1,31 @@
+name: dapr-bot
+
+on:
+  issue_comment: {types: created}
+
+jobs:
+  daprbot:
+    name: bot-processor
+    runs-on: ubuntu-latest
+    steps:
+      - name: Comment analyzer
+        uses: actions/github-script@v1
+        with:
+          github-token: ${{secrets.DAPR_BOT_TOKEN}}
+          script: |
+            const payload = context.payload;
+            const issue = context.issue;
+            const isFromPulls = !!payload.issue.pull_request;
+            const commentBody = payload.comment.body;
+
+            if (!isFromPulls && commentBody && commentBody.indexOf("/assign") == 0) {
+              if (!issue.assignees || issue.assignees.length === 0) {
+                await github.issues.addAssignees({
+                  owner: issue.owner,
+                  repo: issue.repo,
+                  issue_number: issue.number,
+                  assignees: [context.actor],
+                })
+              }
+              return;
+            }