enhance script execution of build and improve docs clarity

Author: YisDav

indexer-certs-creator/README.md

@@ -21,7 +21,7 @@ Run the following script to build the wazuh-certs-generator docker image
 ./build-image.sh -v <IMAGE_TAG> [-m] [-rg <REGISTRY>]
 ```
 
-Replace <IMAGE_TAG> with the new image desired tag.
-Use the `-m` flag to build a multi-architecture image (supports both `amd64` and `arm64`)
-Use the `-rg <REGISTRY>` parameter to specify a custom Docker registry (default is Docker Hub)
-  By default, the script will attempt to push the image to the registry and will only work if credentials are properly configured.
+- Replace <IMAGE_TAG> with the new image desired tag.
+- Use the `-m` flag to build a multi-architecture image (supports both `amd64` and `arm64`)
+  - If multiarch build is enabled, the script will attempt to push the image to the registry and will only work if credentials are properly configured.
+- Use the `-rg <REGISTRY>` parameter to specify a custom Docker registry (default is Docker Hub)

indexer-certs-creator/build-image.sh

@@ -37,11 +37,16 @@ build() {
     set +a
 
     if [ "${MULTIARCH}" ]; then
-        docker buildx bake --file build-image.yml \
+        docker buildx bake \
+            --file build-image.yml \
             --set *.platform=linux/amd64,linux/arm64 \
+            --push \
             --no-cache || clean 1
     else
-        docker buildx bake --file build-image.yml --no-cache || clean 1
+        docker buildx bake \
+            --file build-image.yml \
+            --load \
+            --no-cache || clean 1
     fi
     return 0
 }