Notify slack on new (pre)release tags (#13914)

* Notify slack on new release tags and release branches

* Add changelog url

* Use released version of action

* Only notify slack on tags

.github/actions/build-sign-publish-chainlink/action.yml

@@ -68,6 +68,13 @@ inputs:
     description: When set to the string boolean value of "true", the resulting build image signature will be verified
     default: "false"
     required: false
+outputs:
+  docker-image-tag:
+    description: The docker image tag that was built and pushed
+    value: ${{ steps.save-non-root-image-name-env.outputs.image-tag }}
+  docker-image-digest:
+    description: The docker image digest that was built and pushed
+    value: ${{ steps.save-non-root-image-name-env.outputs.image-digest }}
 
 runs:
   using: composite
@@ -208,10 +215,13 @@ runs:
         IMAGES_NAME_RAW=${{ fromJSON(steps.buildpush-nonroot.outputs.metadata)['image.name'] }}
         IMAGE_DIGEST=${{ fromJSON(steps.buildpush-nonroot.outputs.metadata)['containerimage.digest'] }}
         IMAGE_NAME=$(echo "$IMAGES_NAME_RAW" | cut -d"," -f1)
+        IMAGE_TAG=$(echo "$IMAGES_NAME_RAW" | cut -d":" -f2)
         echo "nonroot_image_name=${IMAGE_NAME}" >> $GITHUB_ENV
         echo '### Docker Image' >> $GITHUB_STEP_SUMMARY
         echo "Image Name: ${IMAGE_NAME}"  >> $GITHUB_STEP_SUMMARY
         echo "Image Digest: ${IMAGE_DIGEST}"  >> $GITHUB_STEP_SUMMARY
+        echo "image-tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT
+        echo "image-digest=${IMAGE_DIGEST}" >> $GITHUB_OUTPUT
 
     - name: Check if non-root image runs as root
       id: check-nonroot-runs-root

.github/workflows/build-publish.yml

@@ -8,6 +8,10 @@ on:
     branches:
       - "release/**"
 
+env:
+  ECR_HOSTNAME: public.ecr.aws
+  ECR_IMAGE_NAME: chainlink/chainlink
+
 jobs:
   checks:
     name: "Checks"
@@ -30,17 +34,23 @@ jobs:
     permissions:
       id-token: write
       contents: read
+    outputs:
+      docker-image-tag: ${{ steps.build-sign-publish.outputs.docker-image-tag }}
+      docker-image-digest: ${{ steps.build-sign-publish.outputs.docker-image-digest }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
 
       - name: Build, sign and publish chainlink image
+        id: build-sign-publish
         uses: ./.github/actions/build-sign-publish-chainlink
         with:
           publish: true
           aws-role-to-assume: ${{ secrets.AWS_OIDC_IAM_ROLE_ARN }}
           aws-role-duration-seconds: ${{ secrets.AWS_ROLE_DURATION_SECONDS }}
           aws-region: ${{ secrets.AWS_REGION }}
+          ecr-hostname: ${{ env.ECR_HOSTNAME }}
+          ecr-image-name: ${{ env.ECR_IMAGE_NAME }}
           sign-images: true
           sign-method: "keypair"
           cosign-private-key: ${{ secrets.COSIGN_PRIVATE_KEY }}
@@ -60,3 +70,44 @@ jobs:
           hostname: ${{ secrets.GRAFANA_INTERNAL_HOST }}
           this-job-name: build-sign-publish-chainlink
         continue-on-error: true
+
+  # Notify Slack channel for new git tags.
+  slack-notify:
+    if: github.ref_type == 'tag'
+    needs: [build-sign-publish-chainlink]
+    runs-on: ubuntu-24.04
+    environment: build-publish
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
+      - name: Notify Slack
+        uses: smartcontractkit/.github/actions/slack-notify-git-ref@7fa90bbeff35aa6ce3a9054f542bcf10b7d47cec # [email protected]
+        with:
+          slack-channel-id: ${{ secrets.SLACK_CHANNEL_RELEASE_NOTIFICATIONS }}
+          slack-bot-token: ${{ secrets.SLACK_BOT_TOKEN_RELENG }} # Releng Bot
+          git-ref: ${{ github.ref_name }}
+          git-ref-type: ${{ github.ref_type }}
+          changelog-url: >-
+            ${{
+              github.ref_type == 'tag' &&
+              format(
+                'https://github.com/{0}/blob/{1}/CHANGELOG.md',
+                github.repository,
+                github.ref_name,
+              ) || ''
+            }}
+          docker-image-name: >-
+            ${{ 
+              github.ref_type == 'tag' && 
+              format(
+                '{0}/{1}:{2}', 
+                env.ECR_HOSTNAME, 
+                env.ECR_IMAGE_NAME, 
+                needs.build-sign-publish-chainlink.outputs.docker-image-tag
+              ) || ''
+            }}
+          docker-image-digest: >-
+            ${{ 
+              github.ref_type == 'tag' && 
+              needs.build-sign-publish-chainlink.outputs.docker-image-digest || ''
+            }}