ci: also build and publish develop images for staging

Extend the docker-publish workflow to trigger on pushes to `develop` in
addition to `main` and version tags. Develop builds are tagged as
`develop` (moving tag, always latest of develop) and `develop-<sha>`
(immutable per-commit tag) so a staging environment can pull either
flavour.

Mirrors the pattern already in use by the monorepo `gateway-publish.yml`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: DavidsonGomes

.github/workflows/docker-publish.yml

@@ -2,7 +2,7 @@ name: Build & Publish Docker Image
 
 on:
   push:
-    branches: [main]
+    branches: [main, develop]
     tags: ["v*.*.*"]
 
 permissions:
@@ -93,6 +93,8 @@ jobs:
             TAGS="${IMAGE}:${VERSION},${IMAGE}:latest"
           elif [[ "${GH_REF}" == refs/heads/main ]]; then
             TAGS="${IMAGE}:latest,${IMAGE}:main-${SHA_SHORT}"
+          elif [[ "${GH_REF}" == refs/heads/develop ]]; then
+            TAGS="${IMAGE}:develop,${IMAGE}:develop-${SHA_SHORT}"
           fi
 
           echo "tags=${TAGS}" >> "$GITHUB_OUTPUT"