Add slapr workflow for automatic slack emoji addition

.github/workflows/slapr.yml

@@ -0,0 +1,28 @@
+---
+name: Slack emoji PR updates
+on:
+  pull_request_review:
+    types: [submitted]
+  pull_request:
+    types: [closed]
+
+jobs:
+  run_slapr_datadog_agent:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        channel_variables:
+          - SLACK_AGENT_PLATFORM_ID
+          - SLACK_AGENT_PLATFORM_REVIEWS_ID
+    steps:
+      - uses: DataDog/slapr@master
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          SLACK_CHANNEL_ID: "${{ secrets.[matrix.channel_variables] }}"
+          SLACK_API_TOKEN: "${{ secrets.SLACK_API_TOKEN }}"
+          SLAPR_BOT_USER_ID: "${{ secrets.SLAPR_BOT_USER_ID }}"
+          SLAPR_EMOJI_REVIEW_STARTED: "review_started"
+          SLAPR_EMOJI_APPROVED: "approved2"
+          SLAPR_EMOJI_CHANGES_REQUESTED: "changes_requested"
+          SLAPR_EMOJI_MERGED: "merged"
+          SLAPR_EMOJI_CLOSED: "closed"