ci: Nicer capture output on tar creation.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

.github/capture.sh

diff --git a/.github/capture.sh b/.github/capture.sh
index 006bd65..601fdb9 100644
--- a/.github/capture.sh
+++ b/.github/capture.sh
@@ -35,6 +35,8 @@
 	    exit -1
 	fi
 
+	echo ::group::PDK tarball
+
 	cd ${SKY130_DIR}
 	tar \
 		--create \
@@ -49,6 +51,8 @@
 		--pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime \
 		\
 		--file ${GITHUB_WORKSPACE}/output/pdk-SKY130A-${STD_CELL_LIBRARY}.tar.xz .
+
+	echo ::endgroup::
 )
 
 echo ::group::Output files