add workflow dispatch to manually trigger io tests on non-ubuntu os

Author: JuliaSprenger

.github/workflows/io-test.yml

@@ -4,24 +4,35 @@ on:
   pull_request:
     branches: [master]
     types: [synchronize, opened, reopened, ready_for_review]
+    inputs:
+      os: 'ubuntu-latest'
 
   # run checks on any change of master, including merge of PRs
   push:
     branches: [master]
 
+  workflow_dispatch:
+    inputs:
+      os:
+        description: 'The operating system to run the tests on'
+        required: True
+        default: 'ubuntu-latest'
+        type: choice
+        options:
+          - macos-latest
+          - windows-latest
+
 concurrency:  # Cancel previous workflows on the same pull request
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
   build-and-test:
-    name: Test on (${{ matrix.os }})
-    runs-on: ${{ matrix.os }}
+    name: Test on (${{ inputs.os }})
+    runs-on: ${{ inputs.os }}
     strategy:
       fail-fast: true
       matrix:
-        # "macos-latest", "windows-latest"
-        os: ["ubuntu-latest", ]
         python-version: ['3.9', ]
     defaults:
       # by default run in bash mode (required for conda usage)