Added gdisk in Earthfile

Author: Cherng Xi Chia

Earthfile

@@ -34,7 +34,7 @@ ENV PATH="${GOBIN}:${PATH}"
 # Only install absolutely essential packages that might be missing
 # Use --no-install-recommends and || true to continue even if some fail
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    bc bash rpm mmdebstrap dosfstools sbsigntool xorriso grub-common cryptsetup \
+    bc bash rpm mmdebstrap dosfstools sbsigntool xorriso grub-common cryptsetup gdisk\
     || echo "Some packages failed to install, continuing..."
 
 RUN ln -s /bin/uname /usr/bin/uname