Improve Slack notifications on release (#35)

.github/workflows/npm-publish.yml

@@ -22,6 +22,21 @@ jobs:
     outputs:
       version: ${{ steps.get-version.outputs.VERSION }}
 
+  release-notes:
+    runs-on: ubuntu-latest
+    needs:
+      - check
+    steps:
+      - uses: actions/checkout@v3
+      - name: Get release notes
+        id: get-release-notes
+        run: |
+          RELEASE_NOTES=$(./tasks/get-release-notes.sh "${{ needs.check.outputs.version }}")
+          echo $RELEASE_NOTES
+          echo "RELEASE_NOTES=$RELEASE_NOTES" >> "$GITHUB_OUTPUT"
+    outputs:
+      release-notes: ${{ steps.get-release-notes.outputs.RELEASE_NOTES }}
+
   lint:
     runs-on: ubuntu-latest
     needs:
@@ -106,10 +121,13 @@ jobs:
     runs-on: ubuntu-latest
     needs:
       - check
+      - release-notes
       - publish-npm
     steps:
-    - uses: rtCamp/action-slack-notify@v2
-      env:
-        SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-        SLACK_ICON: "https://raw.githubusercontent.com/nationalarchives/tna-frontend/main/src/nationalarchives/assets/images/apple-touch-icon.png"
-        SLACK_TITLE: "v${{ needs.check.outputs.version }} of `tna-frontend` has just been published"
+      - uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_TITLE: "`v${{ needs.check.outputs.version }}` of `tna-frontend` has just been published"
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_ICON: "https://raw.githubusercontent.com/nationalarchives/tna-frontend/main/src/nationalarchives/assets/images/apple-touch-icon.png"
+          MSG_MINIMAL: true
+          SLACK_MESSAGE: ${{ needs.release-notes.outputs.release-notes }}

tasks/get-release-notes.sh

@@ -2,7 +2,7 @@
 
 set -e
 awk -v ver="$1" '
- /^## \[[0-9]+.[0-9]+.[0-9]+/ {
+ /^## \[[0-9]+\.[0-9]+\.[0-9]+/ {
   if (p) { exit };
   if (index($2, "[")) {
     split($2, a, "[");