add script to create release tarball

Signed-off-by: Stephan Lachnit <stephanlachnit@protonmail.com>

.gitignore

@@ -10,3 +10,6 @@
 # template.tex output
 # move to *.pdf once manual is done
 template.pdf
+
+# release tarballs
+moderncv-*.tar.gz

create-release-tarball.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# script to create a tarball for the files that should be in the CTAN upload
+
+# fetch version via git
+VERSION=$(git describe --tags --dirty)
+TARBALL=moderncv-$VERSION.tar
+
+# remove existing tarballs
+rm -f $TARBALL $TARBALL.gz
+
+# create tar with all files in git repo
+git archive HEAD > $TARBALL
+
+# remove git specific files
+tar -f $TARBALL --delete .github/ .gitignore create-release-tarball.sh
+
+# compress
+gzip $TARBALL