build Windows artifact with new container

This should get us a current version of Qt and many other newer libraries.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

.github/workflows/scripts/windows-in-container-build.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 # this gets executed inside the container when building a Windows
-# installer on Travis
+# installer as GitHub Action
 #
 # working directory is assumed to be the directory including all the
 # source directories (subsurface, googlemaps, grantlee, etc)

.github/workflows/windows.yml

@@ -3,6 +3,7 @@ on:
   push:
     branches:
     - master
+    - github-action-test
   pull_request:
     branches:
     - master
@@ -11,7 +12,7 @@ jobs:
   buildWindows:
     runs-on: ubuntu-latest
     container:
-      image: docker://subsurface/mxe-build-container:2.2
+      image: docker://subsurface/mxe-build-container:3.0.1
 
     steps:
     - name: checkout sources