Add Slack Announcement

Author: HardeepAsrani

.github/workflows/create-tag.yml

@@ -31,6 +31,8 @@ jobs:
           GIT_AUTHOR_EMAIL: ${{ secrets.BOT_EMAIL }}
           GIT_COMMITTER_NAME: themeisle[bot]
           GIT_COMMITTER_EMAIL: ${{ secrets.BOT_EMAIL }}
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK_ANNOUNCEMENTS }}
+          SEMANTIC_RELEASE_PACKAGE: Gutenberg Blocks and Template Library by Otter
   empty-job:
     # if no jobs run, github action considers it a test failure -- which seems like a bug
     # this makes it so the top-level if statement for the job does not give status failure.

.releaserc.yml

@@ -12,6 +12,14 @@ plugins:
     - prepareCmd: "replace-in-file \"== Changelog ==\" \"== Changelog ==\n\n${nextRelease.notes}\" readme.txt"
   - - "@semantic-release/exec"
     - prepareCmd: grunt version::${nextRelease.version} && grunt wp_readme_to_markdown
+  - - "semantic-release-slack-bot"
+    - notifyOnSuccess: false
+      notifyOnFail: false
+      markdownReleaseNotes: true
+      branchesConfig:
+        - pattern: master
+          notifyOnSuccess: true
+          notifyOnFail: false
   - - "@semantic-release/git"
     - assets:
         - CHANGELOG.md