PE-3802: Copy UI theme file to rootfs fix (#135)

* fix ui overwrite issue

* adding ui files directly into root fs

* Revert "adding ui files directly into root fs"

This reverts commit 39d43fa.

* testing changes

* fix copy to rootfs

Earthfile

@@ -155,14 +155,17 @@ build-iso:
         COPY --if-exists "$CLUSTERCONFIG" /overlay/opt/spectrocloud/clusterconfig/spc.tgz
     END
 
-    COPY --if-exists ui.tar /overlay/opt/spectrocloud/emc/
-    RUN if [ -f /overlay/opt/spectrocloud/emc/ui.tar ]; then \
-        tar -xf /overlay/opt/spectrocloud/emc/ui.tar -C /overlay/opt/spectrocloud/emc && \
-        rm -f /overlay/opt/spectrocloud/emc/ui.tar; \
-    fi
+
 
     WORKDIR /build
     COPY --platform=linux/${ARCH} --keep-own +iso-image-rootfs/rootfs /build/image
+
+    COPY --if-exists ui.tar /build/image/opt/spectrocloud/emc/
+    RUN if [ -f /build/image/opt/spectrocloud/emc/ui.tar ]; then \
+        tar -xf /build/image/opt/spectrocloud/emc/ui.tar -C /build/image/opt/spectrocloud/emc && \
+        rm -f /build/image/opt/spectrocloud/emc/ui.tar; \
+    fi
+
     IF [ "$ARCH" = "arm64" ]
        RUN /entrypoint.sh --name $ISO_NAME build-iso --date=false --overlay-iso /overlay  dir:/build/image --debug  --output /iso/ --arch $ARCH
     ELSE IF [ "$ARCH" = "amd64" ]