ci: Post release notification to Slack (#580)

Author: SMadani

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout the repo
-        uses: actions/checkout@85e6279
+        uses: actions/checkout@85e6279cec87321a52edac9c87bce653a07cf6c2
         with:
           ref: ${{ github.event.release.target_commitish }}
       - name: Setup Java
@@ -33,3 +33,32 @@ jobs:
           MAVEN_PASSWORD: ${{ secrets.OSS_PASSWORD }}
           MAVEN_GPG_PASSPHRASE: ${{ secrets.SIGNING_PASSWORD }}
         run: mvn -e --no-transfer-progress --batch-mode deploy -P release-sign-artifacts
+  notify-release:
+    runs-on: ubuntu-latest
+    name: Notify Release
+    strategy:
+      matrix:
+        url: [SLACK_WEBHOOK_ASK_DEVREL_URL, SLACK_WEBHOOK_DEVREL_TOOLING_URL, SLACK_WEBHOOK_DEVREL_PRIVATE_URL]
+    steps:
+      - name: Send to Slack channels
+        uses: slackapi/slack-github-action@79ad3a9d89410e5b0d961a0e7422f18c62c81bfb
+        with:
+          webhook: ${{ secrets[matrix.url]}}
+          webhook-type: incoming-webhook
+          errors: true
+          payload: |
+            blocks:
+              - type: "header"
+                text:
+                  type: "plain_text"
+                  text: ":initial_external_notification_sent: Version ${{ github.event.release.name }} of the Java Server SDK has been released."
+              - type: "section"
+                text:
+                  type: "mrkdwn"
+                  text: "${{ github.event.release.body }}"
+                  emoji: true
+              - type: "divider"
+              - type: "section"
+                text:
+                  type: "mrkdwn"
+                  text: "You can view the full change log <${{github.event.release.html_url }}|here>."

README.md

@@ -6,7 +6,7 @@
 ![CodeQL](https://github.com/Vonage/vonage-java-sdk/actions/workflows/codeql.yml/badge.svg)
 [![codecov](https://codecov.io/gh/vonage/vonage-java-sdk/branch/main/graph/badge.svg)](https://codecov.io/gh/vonage/vonage-java-sdk)
 [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/Vonage/vonage-java-sdk/badge)](https://scorecard.dev/viewer/?uri=github.com/Vonage/vonage-java-sdk)
-![SLOC](https://sloc.xyz/github/vonage/vonage-java-sdk)
+![SLOC](https://sloc.xyz/github/vonage/vonage-java-sdk?)
 [![Snyk](https://snyk.io/test/github/vonage/vonage-java-sdk/badge.svg)](https://snyk.io/test/github/vonage/vonage-java-sdk)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-v2.1%20adopted-ff69b4.svg)](CODE_OF_CONDUCT.md)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE.txt)