fix: update Dockerfile to specify MIT license directly and remove unused ARG

.github/workflows/publish-image.yml

@@ -90,7 +90,6 @@ jobs:
           file: Dockerfile
           build-args: |
             OCI_SOURCE=${{ steps.vars.outputs.source_url }}
-            OCI_LICENSE=MIT
           platforms: ${{ matrix.platform }}
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}

Dockerfile

@@ -48,9 +48,8 @@ FROM base
 # Image metadata
 LABEL org.opencontainers.image.description="Campfire is a web-based chat application with multiple rooms, direct messages, file attachments with previews, search, web push notifications, @mentions, and bot integrations. Single-tenant; production-ready image with web app, background jobs, caching, file serving, and SSL."
 ARG OCI_SOURCE
-ARG OCI_LICENSE
 LABEL org.opencontainers.image.source=${OCI_SOURCE}
-LABEL org.opencontainers.image.licenses=${OCI_LICENSE}
+LABEL org.opencontainers.image.licenses="MIT"
 
 # Run and own only the runtime files as a non-root user for security
 RUN groupadd --system --gid 1000 rails && \