Add 3 attempts to build+push docker image

Build and push docker images fails due to harbor issues.
Wrap docker.build and customImage.push in buildImage() with a 3-attempt
retry loop and a 5-second delay between attempts.

Signed-off-by: Noam Tsemah <ntsemah@nvidia.com>

Author: ntsemah

src/com/mellanox/cicd/Matrix.groovy

@@ -1185,8 +1185,22 @@ def buildImage(img, filename, extra_args, config, image) {
     if (preBuild) {
         run_shell(preBuild, "Image preparation script")
     }
-    customImage = docker.build("${img}", "-f ${filename} ${extra_args} . ")
-    customImage.push()
+
+    def maxAttempts = 3
+    for (int attempt = 1; attempt <= maxAttempts; attempt++) {
+        try {
+            customImage = docker.build("${img}", "-f ${filename} ${extra_args} . ")
+            customImage.push()
+            break
+        } catch (Exception e) {
+            config.logger.warn("Docker build/push attempt ${attempt}/${maxAttempts} failed for ${img}: ${e.message}")
+            if (attempt < maxAttempts) {
+                sleep(time: 5, unit: 'SECONDS')
+            } else {
+                reportFail('docker build', "Docker build/push failed after ${maxAttempts} attempts for ${img}")
+            }
+        }
+    }
 }
 
 Boolean isEnvVarSet(var) {