Ci: Allow branch selection for sandbox generation

.github/workflows/generate-sandboxes.yml

@@ -3,15 +3,11 @@ name: Generate and publish sandboxes
 on:
   schedule:
     - cron: '2 2 */1 * *'
+  # When triggered manually, GitHub's workflow_dispatch UI provides a native
+  # branch selector ("Use workflow from") that lists every branch on the
+  # remote. The selected branch is exposed as `github.ref_name` and is used
+  # below to decide which branch to generate sandboxes for.
   workflow_dispatch:
-  # To test fixes on push rather than wait for the scheduling, do the following:
-  # 1. Uncomment the lines below and add your branch.
-  # push:
-  #   branches:
-  #     - <your-branch-name>
-  # 2. Change the "ref" value to <your-branch-name> in the actions/checkout step below.
-  # 3. Comment out the whole "generate-main" job starting at line 77
-  # 4. 👉 DON'T FORGET TO UNDO THE STEPS BEFORE YOU MERGE YOUR CHANGES!
 
 env:
   YARN_ENABLE_IMMUTABLE_INSTALLS: 'false'
@@ -22,81 +18,37 @@ defaults:
   run:
     working-directory: ./code
 
+
 jobs:
-  generate-next:
-    name: Generate to next
+  set-branches:
+    name: Resolve target branches
     if: github.repository_owner == 'storybookjs'
     runs-on: ubuntu-latest
+    outputs:
+      branches: ${{ steps.set.outputs.branches }}
     steps:
-      - name: Remove unnecessary files to release disk space
+      - id: set
         working-directory: ${{ github.workspace }}
-        run: |
-          sudo rm -rf \
-            /opt/ghc \
-            /opt/google/chrome \
-            /opt/microsoft/msedge \
-            /opt/microsoft/powershell \
-            /usr/lib/mono \
-            /usr/local/julia* \
-            /usr/local/lib/android \
-            /usr/local/share/chromium \
-            /usr/local/share/powershell \
-            /usr/local/share/powershell \
-            /usr/share/dotnet \
-            /usr/share/swift
-
-      - uses: actions/checkout@v4
-        with:
-          ref: next
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version-file: '.nvmrc'
-
-      - name: Setup git user
-        run: |
-          git config --global user.name "storybook-bot"
-          git config --global user.email "32066757+storybook-bot@users.noreply.github.com"
-
-      - name: Install dependencies
-        working-directory: ./scripts
-        run: node --experimental-modules ./check-dependencies.js
-
-      - name: Compile Storybook libraries
-        run: yarn task --task compile --start-from=auto --no-link
-
-      - name: Publish to local registry
-        run: yarn local-registry --publish
-
-      - name: Run local registry
-        run: yarn local-registry --open &
-
-      - name: Wait for registry
-        run: yarn wait-on tcp:127.0.0.1:6001
-
-      - name: Generate
-        id: generate
-        run: yarn generate-sandboxes --local-registry
-
-      - name: Publish
-        # publish sandboxes even if the generation fails, as some sandboxes might have been generated successfully
-        if: ${{ !cancelled() }}
-        run: yarn publish-sandboxes --remote=https://storybook-bot:${{ secrets.PAT_STORYBOOK_BOT }}@github.com/storybookjs/sandboxes.git --push --branch=next
-
-      - name: Report failure to Discord
-        if: failure()
         env:
-          DISCORD_WEBHOOK: ${{ secrets.DISCORD_MONITORING_URL }}
-        uses: Ilshidur/action-discord@d2594079a10f1d6739ee50a2471f0ca57418b554
-        with:
-          args: |
-            The generation of some or all sandboxes on the **next** branch has failed.
-            [See the job summary for details](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
-
-  generate-main:
-    name: Generate to main
+          EVENT_NAME: ${{ github.event_name }}
+          REF_NAME: ${{ github.ref_name }}
+        run: |
+          if [ "$EVENT_NAME" = "workflow_dispatch" ]; then
+            branches=$(jq -nc --arg ref "$REF_NAME" '[$ref]')
+          else
+            branches='["next","main"]'
+          fi
+          echo "branches=$branches" >> "$GITHUB_OUTPUT"
+
+  generate:
+    name: Generate to ${{ matrix.branch }}
+    needs: set-branches
     if: github.repository_owner == 'storybookjs'
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        branch: ${{ fromJson(needs.set-branches.outputs.branches) }}
     steps:
       - name: Remove unnecessary files to release disk space
         working-directory: ${{ github.workspace }}
@@ -114,9 +66,10 @@ jobs:
             /usr/local/share/powershell \
             /usr/share/dotnet \
             /usr/share/swift
+
       - uses: actions/checkout@v4
         with:
-          ref: main
+          ref: ${{ matrix.branch }}
 
       - uses: actions/setup-node@v4
         with:
@@ -149,8 +102,9 @@ jobs:
 
       - name: Publish
         # publish sandboxes even if the generation fails, as some sandboxes might have been generated successfully
+        # when triggered manually, always publish to the `next` branch on the sandboxes repo
         if: ${{ !cancelled() }}
-        run: yarn publish-sandboxes --remote=https://storybook-bot:${{ secrets.PAT_STORYBOOK_BOT }}@github.com/storybookjs/sandboxes.git --push --branch=main
+        run: yarn publish-sandboxes --remote=https://storybook-bot:${{ secrets.PAT_STORYBOOK_BOT }}@github.com/storybookjs/sandboxes.git --push --branch=${{ github.event_name == 'workflow_dispatch' && 'next' || matrix.branch }}
 
       - name: Report failure to Discord
         if: failure()
@@ -159,5 +113,5 @@ jobs:
         uses: Ilshidur/action-discord@d2594079a10f1d6739ee50a2471f0ca57418b554
         with:
           args: |
-            The generation of some or all sandboxes on the **main** branch has failed.
+            The generation of some or all sandboxes on the **${{ matrix.branch }}** branch has failed.
             [See the job summary for details](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})