update-manual-test: special-case Windows/ARM64 runners

For a little more than two weeks, as of time of writing, there are
GitHub-hosted Windows/ARM64 runners (at long last!), announced here:
https://github.blog/changelog/2025-04-14-windows-arm64-hosted-runners-now-available-in-public-preview/

These are not yet listed in the `runner-images` README, therefore we
want to add them manually.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/manual-test.yml

@@ -19,6 +19,7 @@ on:
           - windows-2025
           - windows-2022
           - windows-2019
+          - windows-11-arm
       container-runs-on:
         type: choice
         description: 'The Docker container to run the job on (this overrides the `runs-on` input)'

.github/workflows/update-manual-test.js

@@ -35,6 +35,11 @@
     })
     .filter(runsOn => runsOn)
 
+  // The Windows/ARM64 runners are in public preview (and for the time being,
+  // not listed in the `runner-images` README file), so we need to add this
+  // manually.
+  if (!choices.includes('windows-11-arm')) choices.push('windows-11-arm')
+
   // Now edit the `manual-test` workflow definition
   const ymlPath = `${__dirname}/manual-test.yml`
   const yml = fs.readFileSync(ymlPath, 'utf8')