Ensure all asdf managed versions can be installed after updated by re…

…novatebot

kachick/renovate-config-asdf#304

.github/workflows/ci-tool-versions.yml

@@ -0,0 +1,25 @@
+name: CI - .tool-versions
+on:
+  pull_request:
+    paths:
+      - '.tool-versions'
+      - '**/.tool-versions'
+
+jobs:
+  installable:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v3
+      - run: git fetch origin ${{ github.base_ref }} --depth=1
+      - name: Re-format only changed .tool-versions
+        id: format-only-new-versions
+        # Do not use `echo json=$(script)` syntax here. The script generates multilines.
+        run: |
+          tempfile="$(mktemp)"
+          echo -n 'json=' | tee --append "$tempfile"
+          git diff origin/${{ github.base_ref }} HEAD --word-diff --relative ./examples/.tool-versions | grep -F ']{+' | ruby -r json -e 'puts STDIN.each_line.map { |l| /\A(\S+\s+).*?\{\+([^\+]+)/.match(l).captures.join }.join("\n").to_json' | tee --append "$tempfile"
+          cat "$tempfile" | tee --append $GITHUB_OUTPUT
+      - uses: asdf-vm/actions/install@v1
+        with:
+          tool_versions: '${{ fromJson(steps.format-only-new-versions.outputs.json) }}'