Sending alerts on devex_alerts channel (#48)

* added support for alerts on slack channel for PRs

* added permissions for read-only to the alert-workflow

* Fixed the alert description

* added code to debug the pr details when it is unable to fetch it

* fixed bugs and removed unnecessary code

* added devex alerts secret

* removed unnecessary code

Author: giriraj-singh-couchbase

.github/workflows/alert-on-pr.yml

@@ -0,0 +1,52 @@
+name: Alert on PR Changes
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+
+jobs:
+  alert:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install requests
+        run: |
+          python -m pip install --upgrade pip
+          pip install requests
+
+      - name: Send Slack alert on PR changes
+        env:
+          SLACK_WEBHOOK: ${{ secrets.DEVEX_ALERTS_SECRET }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          import requests, os
+          repo = os.environ.get('GITHUB_REPOSITORY')
+          pr_number = os.environ.get('PR_NUMBER')
+          token = os.environ.get('GITHUB_TOKEN')
+          api_url = f"https://api.github.com/repos/{repo}/pulls/{pr_number}"
+          headers = {'Authorization': f'token {token}', 'Accept': 'application/vnd.github.v3+json'}
+          pr_resp = requests.get(api_url, headers=headers)
+          branch_name = os.environ.get('GITHUB_HEAD_REF', '')
+          if pr_resp.status_code == 200:
+              pr_data = pr_resp.json()
+              pr_title = pr_data.get('title', '')
+              pr_body = pr_data.get('body', '')
+              pr_user = pr_data.get('user', {}).get('login', '')
+              pr_url = pr_data.get('html_url', '')
+              message = f"PR Alert!\nTitle: {pr_title}\nBranch: {branch_name}\nAuthor: {pr_user}\nURL: {pr_url}\nDescription: {pr_body}"
+          else:
+              message = f"PR Alert!\nUnable to fetch PR details.\nStatus Code: {pr_resp.status_code}\nResponse: {pr_resp.text}"
+          webhook = os.environ['SLACK_WEBHOOK']
+          requests.post(webhook, json={"text": message})
+        shell: python