4.0.x-alphas workflow: sync with main

.github/workflows/release-4.0.x-alphas.yaml

@@ -16,16 +16,12 @@ jobs:
     steps:
       - name: Compute prerelease identifier from commit SHA
         run: echo "PRERELEASE_IDENTIFIER=`echo ${{ github.sha }} | cut -c1-8`" >> $GITHUB_ENV
-      - name: Compute human-readable release timestamp
-        run: echo "PRERELEASE_TIMESTAMP=`date --rfc-3339=seconds`" >> $GITHUB_ENV
-      - name: Compute UNIX release timestamp
-        run: echo "PRERELEASE_UNIX_TIMESTAMP=`date +%s`" >> $GITHUB_ENV
-      - name: Trigger an alpha release build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
+      - name: Trigger a 4.0.x alpha release build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
         run: |
           curl -L \
             -X POST \
             -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer ${{ secrets.RABBITMQCI_BOT_TOKEN }}" \
             -H "X-GitHub-Api-Version: 2022-11-28" \
             https://api.github.com/repos/${{ env.DEV_WORKFLOW_REPOSITORY }}/dispatches \
-            -d '{ "event_type": "new_4.0.x_alpha", "client_payload": {"release_repository": "${{ env.DEV_WORKFLOW_REPOSITORY }}", "release_description": "Commit: https://github.com/rabbitmq/rabbitmq-server/commit/${{ github.sha }}, build was triggered at: ${{ env.PRERELEASE_TIMESTAMP }}", "prerelease": true, "prerelease_kind": "alpha", "prerelease_identifier": "${{ env.PRERELEASE_IDENTIFIER }}", "release_title": "RabbitMQ ${{ vars.SERVER_40_NEXT_PATCH_VERSION }}-alpha.${{ env.PRERELEASE_IDENTIFIER }} (${{ env.PRERELEASE_TIMESTAMP }})", "base_version": "${{ vars.SERVER_40_NEXT_PATCH_VERSION }}", "release_timestamp": "${{ env.PRERELEASE_TIMESTAMP }}", "release_unix_timestamp": "${{ env.PRERELEASE_UNIX_TIMESTAMP }}" }}'
+            -d '{ "event_type": "new_4.0.x_alpha", "client_payload": {"release_repository": "${{ env.DEV_WORKFLOW_REPOSITORY }}", "release_description": "Commit: https://github.com/rabbitmq/rabbitmq-server/commit/${{ github.sha }}, pushed at: ${{ github.event.repository.pushed_at }}", "prerelease": true, "prerelease_kind": "alpha", "prerelease_identifier": "${{ env.PRERELEASE_IDENTIFIER }}", "release_title": "RabbitMQ ${{ vars.SERVER_40_NEXT_PATCH_VERSION }}-alpha.${{ env.PRERELEASE_IDENTIFIER }} (from ${{ github.event.repository.pushed_at }})", "base_version": "${{ vars.SERVER_41_NEXT_PATCH_VERSION }}" }}'