Enable integration testing on Windows in GitHub CI

- parameterize the test matrix
- apply conditions when certain steps will be executed

.github/workflows/kerberos.yml → .github/workflows/integration.yml

@@ -1,4 +1,4 @@
-name: kerberos
+name: integration test
 
 # NOTE: Restricting branches prevents jobs from being doubled since
 # a push to a pull request triggers two events.
@@ -12,10 +12,12 @@ on:
 
 jobs:
   test-on-linux:
-    name: tcms-api on Linux
-    runs-on: ubuntu-latest
+    name: Py${{ matrix.python-version }} @ ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest]
         python-version: [3.6]
 
     steps:
@@ -32,6 +34,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install Python dependencies
+      if: ${{ matrix.os }} == 'ubuntu-latest'
       run: |
         sudo apt-get install libkrb5-dev
         pip install coverage kerberos
@@ -42,6 +45,7 @@ jobs:
         make run-services
 
     - name: Install & configure Kerberos client
+      if: ${{ matrix.os }} == 'ubuntu-latest'
       run: |
         KRB5_ADDR=`docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' krb5_kiwitcms_org`