ci(bstein-home): use mounted harbor auth config

Jenkinsfile

@@ -175,23 +175,21 @@ PY
     stage('Prep toolchain') {
       steps {
         container('builder') {
-          withCredentials([usernamePassword(credentialsId: 'harbor-robot', usernameVariable: 'HARBOR_USERNAME', passwordVariable: 'HARBOR_PASSWORD')]) {
-            sh '''
-              set -euo pipefail
-              for attempt in 1 2 3 4 5; do
-                if apk add --no-cache bash git jq curl; then
-                  break
-                fi
-                if [ "$attempt" -eq 5 ]; then
-                  echo "apk add failed after ${attempt} attempts" >&2
-                  exit 1
-                fi
-                sleep $((attempt * 2))
-              done
-              mkdir -p /root/.docker
-              printf '%s' "${HARBOR_PASSWORD}" | docker login registry.bstein.dev -u "${HARBOR_USERNAME}" --password-stdin
-            '''
-          }
+          sh '''
+            set -euo pipefail
+            for attempt in 1 2 3 4 5; do
+              if apk add --no-cache bash git jq curl; then
+                break
+              fi
+              if [ "$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
+          '''
         }
       }
     }