ci: raise docker build timeout 30→45m

The image build (uv sync + bge-m3 + docling layers) runs ~30m and was
hitting the 30m cap, cancelling the publish of :main. Give it headroom.

Author: NorthernLightx

.github/workflows/docker.yml

@@ -38,7 +38,7 @@ concurrency:
 jobs:
   validate:
     runs-on: ubuntu-latest
-    timeout-minutes: 30
+    timeout-minutes: 45
 
     steps:
       - uses: actions/checkout@v4
@@ -73,7 +73,7 @@ jobs:
   publish:
     if: github.event_name == 'push'
     runs-on: ubuntu-latest
-    timeout-minutes: 30
+    timeout-minutes: 45
 
     steps:
       - uses: actions/checkout@v4