fix: use jq for webhook JSON encoding to handle multiline commit messages

The webhook trigger was failing with curl errors:
  curl: (6) Could not resolve host: requirements
  curl: (7) Failed to connect to localhost port 9000

The issue:
- Commit messages with newlines were breaking shell parsing
- Inline JSON string in curl -d was being split by the shell
- Multiline commit messages caused curl to misinterpret arguments

Solution:
- Use jq to construct JSON with proper escaping
- Pass GitHub variables as jq --arg parameters
- Pipe JSON to curl with -d @- to read from stdin
- This safely handles newlines, quotes, and special characters

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitea/workflows/main.yml

@@ -390,15 +390,16 @@ jobs:
     steps:
       - name: Trigger webhook
         run: |
+          jq -n \
+            --arg branch "main" \
+            --arg commit "${{ github.sha }}" \
+            --arg message "${{ github.event.head_commit.message }}" \
+            --arg tag "${{ needs.docker-build-and-push.outputs.image_tag }}" \
+            '{branch: $branch, commit: $commit, message: $message, tag: $tag}' | \
           curl -X POST ${{ secrets.WEBHOOK_URL }} \
             -H "Content-Type: application/json" \
             -H "X-Webhook-Secret: ${{ secrets.WEBHOOK_SECRET }}" \
-            -d '{
-              "branch": "main",
-              "commit": "${{ github.sha }}",
-              "message": "${{ github.event.head_commit.message }}",
-              "tag": "${{ needs.docker-build-and-push.outputs.image_tag }}"
-            }' || echo "Webhook call failed, but continuing..."
+            -d @- || echo "Webhook call failed, but continuing..."
 
       - name: Deployment triggered
         run: |