Add await-http-resource action

* Use `await-http-resource` action in the `spring-artifactory-deploy-to-maven-central.yml`
to wait until one of the jars from the release is available in Maven Central repo

Author: artembilan

.github/actions/await-http-resource/action.yml

@@ -0,0 +1,19 @@
+name: Await HTTP Resource
+description: 'Waits for an HTTP resource to be available (a HEAD request succeeds)'
+inputs:
+  url:
+    description: 'URL of the resource to await'
+    required: true
+runs:
+  using: composite
+  steps:
+    - name: Await HTTP resource
+      shell: bash
+      run: |
+        echo "Waiting for ${{ inputs.url }}"
+        until curl --fail --head --silent "${{ inputs.url }}" > /dev/null
+        do
+          echo "."
+          sleep 60
+        done
+        echo "${{ inputs.url }} is available"

.github/workflows/spring-artifactory-deploy-to-maven-central.yml

@@ -45,10 +45,15 @@ jobs:
       - uses: jfrog/setup-jfrog-cli@v4
 
       - name: Download Release Files
+        id: download-release-files
         run: |
           jfrog rt download \
             --spec utils/release-files-spec.json \
             --spec-vars "buildname=${{ inputs.buildName }};buildnumber=${{ inputs.buildNumber }}"
+          
+          jarToCheck=$(find nexus -name "*.jar" -print -quit)
+          jarToCheck=${jarToCheck#nexus}
+          echo jarToCheck=$jarToCheck >> $GITHUB_OUTPUT
 
       - uses: spring-io/nexus-sync-action@v0.0.1
         id: nexus
@@ -63,4 +68,9 @@ jobs:
           close: true
           release: true
           close-timeout: 3600
-          release-timeout: 3600
+          release-timeout: 3600
+
+      - name: Await for Artifact in Maven Central Repository
+        uses: ./.github/actions/await-http-resource
+        with:
+          url: 'https://repo.maven.apache.org/maven2'${{ steps.download-release-files.outputs.jarToCheck }}