4.0.x alpha build workflow: don't reinvent the wheel

Author: michaelklishin

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

@@ -8,6 +8,7 @@ on:
       - "deps/*/src/**"
       - 'deps/rabbitmq_management/priv/**'
       - ".github/workflows/**"
+      - "rabbitmq-components.mk"
 env:
   DEV_WORKFLOW_REPOSITORY: "rabbitmq/server-packages"
 jobs:
@@ -16,12 +17,19 @@ jobs:
     steps:
       - name: Compute prerelease identifier from commit SHA
         run: echo "PRERELEASE_IDENTIFIER=`echo ${{ github.sha }} | cut -c1-8`" >> $GITHUB_ENV
-      - 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 }}, 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 }}" }}'
+      - name: Trigger a 4.0.x alpha build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
+        uses: peter-evans/repository-dispatch@v3
+        with:
+          token: ${{ secrets.RABBITMQCI_BOT_TOKEN }}
+          repository: ${{ env.DEV_WORKFLOW_REPOSITORY }}
+          event-type: "new_4.0.x_alpha"
+          client-payload: |-
+            {
+              "release_repository": "${{ 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_40_NEXT_PATCH_VERSION }}"
+            }