Merge pull request 'ci: retry apk installs' (#5) from feature/ariadne-integration-portal into master

Reviewed-on: #5

Jenkinsfile

@@ -86,7 +86,16 @@ spec:
         container('builder') {
           sh '''
             set -euo pipefail
-            apk add --no-cache bash git jq
+            for attempt in 1 2 3 4 5; do
+              if apk add --no-cache bash git jq; then
+                break
+              fi
+              if [ "$attempt" -eq 5 ]; then
+                echo "apk add failed after ${attempt} attempts" >&2
+                exit 1
+              fi
+              sleep $((attempt * 2))
+            done
             mkdir -p /root/.docker
             cp /docker-config/config.json /root/.docker/config.json
           '''