Add GitHub Actions workflow for Azure Web App deployment

[Mandax94]

This workflow builds and pushes a Docker container to an Azure Web App upon commits to the main branch.

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Note

Adds a GitHub Actions workflow that builds a Docker image, pushes it to GHCR, and deploys it to an Azure Web App on main pushes (or manual run).

• CI/CD:
  • New workflow /.github/workflows/azure-container-webapp.yml triggered on push to main and workflow_dispatch.
  • Build job: uses docker/setup-buildx-action, logs into ghcr.io, builds and pushes image tagged with ${{ github.sha }} from Dockerfile.
  • Deploy job: uses azure/webapps-deploy@v2 to deploy the pushed image to Azure App Service using AZURE_WEBAPP_PUBLISH_PROFILE and AZURE_WEBAPP_NAME.

^{Written by Cursor Bugbot for commit 7b878d5. This will update automatically on new commits. Configure here.}

[cursor]

Bug: Missing packages write permission for container push

The workflow sets permissions to only contents: read, but the build job pushes a Docker image to GitHub Container Registry at line 63. Pushing to GHCR requires packages: write permission for the GITHUB_TOKEN. Without this permission, the Docker push operation will fail with an authorization error, preventing the workflow from completing successfully.