Scripts: Set errexit to catch errors

packaging/source/buildpackage.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 # OpenRA packaging script for versioned source tarball
 
+set -o errexit || exit $?
+
 if [ $# -ne "2" ]; then
 	echo "Usage: $(basename "$0") tag outputdir"
 	exit 1
@@ -19,7 +21,7 @@ make version VERSION="${TAG}"
 # The output from `git ls-tree` is too long to fit in a single command (overflows MAX_ARG_STRLEN)
 # so `xargs` will automatically split the input across multiple `tar` commands.
 # Use the amend flag (r) to prevent each call erasing the output from earlier calls.
-rm "${OUTPUTDIR}/OpenRA-${TAG}-source.tar"
+rm "${OUTPUTDIR}/OpenRA-${TAG}-source.tar" || :
 git ls-tree HEAD --name-only -r -z | xargs -0 tar vrf "${OUTPUTDIR}/OpenRA-${TAG}-source.tar"
 bzip2 "${OUTPUTDIR}/OpenRA-${TAG}-source.tar"