refactor: update output artifact format to zstd and enhance compression process

Jenkinsfile

@@ -31,7 +31,9 @@ pipeline {
                         debootstrap \
                         xz-utils \
                         tar \
-                        ca-certificates
+                        ca-certificates \
+                        zstd \
+                        pv
 
                 '''
 

build-rootfs.sh

@@ -17,7 +17,7 @@ ESPOS_REPO="https://repo.elordenador.org"
 ESPOS_SUITE="espos-unstable"
 
 ROOTFS="$(pwd)/rootfs"
-OUTPUT="espos-openrc-rootfs.tar.xz"
+OUTPUT="espos-openrc-rootfs.tar.zst"
 
 
 KEYRING_PACKAGE="espos-archive-keyring"
@@ -235,13 +235,19 @@ umount -lf "$ROOTFS/dev" || true
 umount -lf "$ROOTFS/proc" || true
 umount -lf "$ROOTFS/sys" || true
 
-echo "[+] Creating artifact"
 
+echo "[+] Calculando tamaño"
+
+SIZE=$(du -sb "$ROOTFS" | cut -f1)
+
+echo "[+] Creando rootfs comprimido"
 
 tar \
     --numeric-owner \
     -C "$ROOTFS" \
-    -cJf "$OUTPUT" .
+    -cf - . \
+| pv -s "$SIZE" \
+| zstd -19 -T0 -o "$OUTPUT"