Add a squashfs package

Add a squashfs package to test directory in EOS

.gitlab/squashfs.sh

+# Create squashfs package with the contents of a EOS directory in an EOS path 
+
+# Input:
+# $1: The EOS directory of the package
+# $2: The subdirectory to copy into the package
+
+echo "Input params: "
+echo "Package path: $1"
+echo "Copied Directory: $2"
+
+eos root://eoshome.cern.ch squash rm $1
+eos root://eoshome.cern.ch squash new $1
+cp -r $2/. $1/
+eos root://eoshome.cern.ch squash pack $1