Ensure gpg-agent is properly setup on windows

.github/workflows/build.yml

@@ -27,9 +27,23 @@ jobs:
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
 
-    - name: Setup gpg-agent
+    # The default version of gpg installed on the runners is outdated and doesn't 
+    # work as expected.
+    #
+    # This installed the latest gpg4win version.
+    #
+    # See original reference here https://github.com/orgs/community/discussions/24933
+    - name: Setup GnuPG [windows]
+      if: ${{ matrix.os == 'windows-latest' }}
+      run: |
+        $env:PATH = "C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\ProgramData\chocolatey\bin"
+        [Environment]::SetEnvironmentVariable("Path", $env:PATH, "Machine")
+        choco install --yes gpg4win
+        echo "C:\Program Files (x86)\Gpg4win\..\GnuPG\bin" >> $env:GITHUB_PATH
+
+    - name: Show gpg-agent info
       run: |
-        gpg-agent --daemon || true
+        gpg-connect-agent /bye
 
     # The default version of openssh on windows server is quite old (8.1) and doesn't have
     # all the necessary signing/verification commands available