Start converting the GitHub workflow

The `setup-git-for-windows-sdk` Action needs to run on Windows, for
one...

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/test.yml

@@ -2,21 +2,22 @@ name: 'build-test'
 on: # rebuild any PRs and main branch changes
   pull_request:
   push:
+    tags:
     branches:
       - main
-      - 'releases/*'
+      - 'v[0-9]*'
 
 jobs:
   build: # make sure build/ci work properly
-    runs-on: ubuntu-latest
+    runs-on: windows-latest
     steps:
       - uses: actions/checkout@v2
       - run: |
           npm install
       - run: |
           npm run all
   test: # make sure the action works on a clean machine without building
-    runs-on: ubuntu-latest
+    runs-on: windows-latest
     steps:
       - uses: actions/checkout@v2
       - uses: ./