Move gcc/Linux into its own job, tagged "linux".

Add Windows build job.

.gitlab-ci.yml

-# This file is a template, and might need editing before it works on your project.
-# use the official gcc image, based on debian
-# can use verions as well, like gcc:5.2
-# see https://hub.docker.com/_/gcc/
+linux job:
+  tags: linux
   image: gcc
 
   build-sbbs:
@@ -51,8 +49,18 @@ build-syncterm:
       paths:
         - "src/syncterm/*.exe.release/*"
 
-# run tests using the binary built before
-#test:
-#  stage: test
-#  script:
-#    - ./runmytests.sh
+
+window job:
+  tags: windows
+
+  build-sbbs:
+    stage: build
+    script:
+      - cd src/sbbs3
+      - build.bat
+    artifacts:
+      name: sbbs
+      paths:
+        - "src/sbbs3/*.exe.release/*"
+        - "src/sbbs3/*.lib.release/*"
+        - "src/sbbs3/*/*.exe.release/*"