Tag Docker images with both git tag and latest

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build.yaml

@@ -30,6 +30,7 @@ jobs:
           if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
             TAG=${{ inputs.tag }}
           fi
-          IMAGE=gitea.home.hrajfrisbee.cz/${{ github.repository }}:$TAG
-          docker build -f build/Dockerfile -t $IMAGE .
-          docker push $IMAGE
+          REPO=gitea.home.hrajfrisbee.cz/${{ github.repository }}
+          docker build -f build/Dockerfile -t $REPO:$TAG -t $REPO:latest .
+          docker push $REPO:$TAG
+          docker push $REPO:latest