Add support for the /synchronize-sdks command

This slash command will trigger the `sync` workflows in the Git SDK
repositories, which updates them according to the Pacman repositories.

This is particularly useful after deploying a package, to make sure that
the next `git-artifacts` build will pick up the new package version.

For convenience, there is also the `/sync` shortcut.

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

Author: dscho

GitForWindowsHelper/slash-commands.js

@@ -529,6 +529,50 @@ module.exports = async (context, req) => {
             const answer2 = await appendToIssueComment(context, await getToken(), owner, repo, commentId, `The workflow run [was started](${answer.html_url})`)
             return `I edited the comment: ${answer2.html_url}`
         }
+
+        if (command === '/synchronize-sdks' || command === '/sync') {
+            if (owner !== 'git-for-windows') {
+                return `Ignoring ${command} in unexpected repo: ${commentURL}`
+            }
+
+            await checkPermissions()
+
+            await thumbsUp()
+
+            const triggerWorkflowDispatch = require('./trigger-workflow-dispatch')
+            const triggerSync = async (sdkRepo) =>
+                await triggerWorkflowDispatch(
+                    context,
+                    await getToken('git-for-windows', sdkRepo),
+                    'git-for-windows',
+                    sdkRepo,
+                    'sync.yml',
+                    'main'
+                )
+
+            const { appendToIssueComment } = require('./issues')
+            const appendToComment = async (text) =>
+                await appendToIssueComment(
+                    context,
+                    await getToken(),
+                    owner,
+                    repo,
+                    commentId,
+                    text
+                )
+
+            for (const architecture of ['aarch64', 'x86_64', 'i686']) {
+                const sdkRepo = {
+                    aarch64: 'git-sdk-arm64',
+                    x86_64: 'git-sdk-64',
+                    i686: 'git-sdk-32'
+                }[architecture]
+                const sync = await triggerSync(sdkRepo)
+                commentURL = (await appendToComment(`The ['sync' run for ${architecture}](${sync.html_url}) was started.`)).html_url
+            }
+
+            return `I edited the comment: ${commentURL}`
+        }
     } catch (e) {
         await react('confused')
         throw e

README.md

@@ -45,6 +45,12 @@ For convenience, the command can be abbreviated as `/add relnote <type> <message
 
 **What does it do?** This triggers one ore more [GitHub workflow runs](https://github.com/git-for-windows/git-for-windows-automation/actions/workflows/build-and-deploy.yml) to build and deploy Git for Windows' [Pacman packages](https://github.com/git-for-windows/git/wiki/Package-management).
 
+### `/synchronize-sdks`
+
+**Where can it be called?** In Issues and Pull Requests of Git for Windows' repositories.
+
+**What does it do?** This triggers the `sync` GitHub workflow runs in Git for Windows' `git-sdk-*` repositories, i.e. updates them with the newest package versions as per the Pacman repositories.
+
 ### `/git-artifacts`
 
 **Where can it be called?** In `git-for-windows/git`'s [Pull Requests](https://github.com/git-for-windows/git/pulls)