Allow daily PowerShell test to fail

Really, it's the installation that's failing because literally the upstream
posting of new daily PowerShell builds is broken.

If it succeeds, TestFull and the daily schedule will run it.
If it doesn't, they'll ignore it because the build script will skip it.

Author: andyleejordan

.github/workflows/ci-test.yml

@@ -47,6 +47,7 @@ jobs:
 
       - name: Install daily
         if: ${{ github.event_name == 'schedule' || github.event_name == 'merge_group' }}
+        continue-on-error: true
         shell: pwsh
         run: ./pwsh/tools/install-powershell.ps1 -Daily