Add retry logic to artifact download action (#10588)

# Description

Add retry logic (3 attempts with exponential backoff) to
`download-artifact-extract` action using conditional steps. Update
`zombienet_cumulus` workflow to use the custom action for consistent
retry behavior.

Author: DenzelPenzel

.github/actions/download-artifact-extract/action.yml

@@ -29,15 +29,45 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - name: Download artifact
+    - name: Download artifact (attempt 1)
+      id: download_attempt_1
+      continue-on-error: true
+      uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
+      with:
+        name: ${{ inputs.artifact-name }}
+        github-token: ${{ inputs.gh-token }}
+        run-id: ${{ inputs.run-id }}
+        path: ${{ inputs.extract-path }}
+
+    - name: Wait before retry 1
+      if: steps.download_attempt_1.outcome == 'failure'
       shell: bash
       run: |
-        echo "::group::📦 Downloading ${{ inputs.artifact-name }}"
-        echo "Artifact: ${{ inputs.artifact-name }}"
-        echo "Run ID: ${{ inputs.run-id }}"
-        echo "::endgroup::"
-    
-    - uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
+        echo "::warning::Attempt 1 failed, retrying in 10s..."
+        sleep 10
+
+    - name: Download artifact (attempt 2)
+      id: download_attempt_2
+      if: steps.download_attempt_1.outcome == 'failure'
+      continue-on-error: true
+      uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
+      with:
+        name: ${{ inputs.artifact-name }}
+        github-token: ${{ inputs.gh-token }}
+        run-id: ${{ inputs.run-id }}
+        path: ${{ inputs.extract-path }}
+
+    - name: Wait before retry 2
+      if: steps.download_attempt_2.outcome == 'failure'
+      shell: bash
+      run: |
+        echo "::warning::Attempt 2 failed, retrying in 20s..."
+        sleep 20
+
+    - name: Download artifact (attempt 3)
+      id: download_attempt_3
+      if: steps.download_attempt_2.outcome == 'failure'
+      uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
       with:
         name: ${{ inputs.artifact-name }}
         github-token: ${{ inputs.gh-token }}

.github/workflows/zombienet_cumulus.yml

@@ -80,11 +80,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
-      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+      - name: Download test parachain artifact
         if: ${{ matrix.test.needs-wasm-binary }}
+        uses: ./.github/actions/download-artifact-extract
         with:
-          name: build-test-parachain-${{ needs.preflight.outputs.SOURCE_REF_SLUG }}
-          github-token: ${{ secrets.GITHUB_TOKEN }}
+          artifact-name: build-test-parachain-${{ needs.preflight.outputs.SOURCE_REF_SLUG }}
+          gh-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ needs.preflight.outputs.BUILD_RUN_ID }}
 
       - name: zombienet_test