xi: modernise, both in version numbers, and style a little go.yml wor…

…kflow

.github/workflows/go.yml

@@ -1,20 +1,35 @@
 name: Go
-on: [push]
+on:
+  push:
+    branches:
+      - "main"
+      - "gen-docs"
+  pull_request:
+    branches:
+      - "main"
 jobs:
 
   build:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        version: [ '1.12', 'stable', 'oldstable', ]
+
+    runs-on: ${{ matrix.os }}
+
     name: Build
-    runs-on: ubuntu-latest
+      #runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.12
-      uses: actions/setup-go@v1
+    - name: Set up Go ${{ matrix.version }}
+      uses: actions/setup-go@v5
       with:
-        go-version: 1.12
+        go-version: ${{ matrix.version }}
+
       id: go
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
+      uses: actions/checkout@v4
 
     - name: Get dependencies
       run: |