🤖 ci(docker): auto-build on push to main + fix root Dockerfile swag step

Enable Docker image build on every push to main (paths-ignore for docs-only changes mirrors webapp pattern). Fix root Dockerfile (shipped by #89) which was missing the swag init step required for //go:embed of swagger.json (gitignored).

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

.gitea/workflows/docker-push.yaml

@@ -6,7 +6,6 @@
 name: Docker Push
 
 on:
-  # Manual trigger for testing or production
   workflow_dispatch:
     inputs:
       ref:
@@ -14,6 +13,18 @@ on:
         required: false
         type: string
         default: ''
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'README.md'
+      - 'AGENTS.md'
+      - 'CHANGELOG.md'
+      - 'AGENT_CHANGELOG.md'
+      - 'documentation/**'
+      - 'adr/**'
+      - 'chart/**'
+      - 'features/**'
 
 # Environment variables
 env: