Port slack notification over from KDS (#13)

* port over from KDS

* add changeset

* update messaging

.changeset/silent-coats-melt.md

@@ -0,0 +1,2 @@
+---
+---

.github/workflows/changeset.yaml

@@ -9,43 +9,37 @@ jobs:
   version:
     runs-on: ubuntu-latest
     outputs:
-      published: ${{ steps.changesets.outputs.published }}
+      hasChangesets: ${{ steps.changesets.outputs.hasChangesets }}
+      hasPublished: ${{ steps.changesets.outputs.published }}
     env:
       GITHUB_TOKEN: ${{ github.token }}
       NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
     steps:
       - uses: actions/checkout@v3
       - uses: ./.github/actions/setup
       - name: Create Release Pull Request or Publish to npm
-        id: changesets
         run: |
           npm config set "//registry.npmjs.org/:_authToken" "$NPM_TOKEN"
       - uses: changesets/action@v1
+        id: changesets
         with:
           title: "Changeset: Version packages"
           commit: "version packages"
           version: yarn ci:version
           publish: yarn ci:publish
-      - name: Push git tags
-        if: steps.changesets.outputs.published == 'true'
-        run: git push --follow-tags
-  notify:
+  notify-slack:
     runs-on: ubuntu-latest
-    needs: version
+    needs:
+      version
+      # We only trigger this flow if the publish is happening, inferred by not having a changeset.
+    if: needs.version.outputs.hasChangesets == 'false'
+    env:
+      PUBLISHED: ${{ needs.version.outputs.hasPublished }}
     steps:
-      - name: Publish successful
-        if: needs.version.outputs.published == 'true'
-        uses: slackapi/[email protected]
-        with:
-          channel-id: "C02NUQ27G56"
-          slack-message: "Legacy Packages have been published"
-        env:
-          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
-      - name: Publish failed
-        if: needs.version.outputs.published == 'false'
+      - name: Send
         uses: slackapi/[email protected]
         with:
           channel-id: "C02NUQ27G56"
-          slack-message: "Legacy Publish failed"
+          slack-message: ${{ env.PUBLISHED == 'true' && 'Legacy packages have been published' || 'Legacy Publishing failed' }}
         env:
           SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}