github-actionify.sh: fix sed expressions

The repoSlug contains a slash, which will affect the expression
if slash is used as the delimiter. So we change to semicolon.

The command "sed -i" with no extension does not work with BSD sed
(e.g. macOS); you need to write "sed -i ''" to avoid saving the
previous file to a backup. But this doesn't work with GNU sed,
which requires "sed -i''" or simply "sed -i" instead. The only
way I know that works with both sed flavors is to give the flag
as "-i.bak" and then delete the .bak file afterward.

Author: ctrueden

github-actionify.sh

@@ -109,8 +109,9 @@ process() {
 
 	# Change pom.xml from Travis CI to GitHub Action
 	domain="github.com"
-	sed -i 's/Travis CI/GitHub Actions/g' pom.xml
-	sed -i "s/travis-ci.*/github.com\/$repoSlug\/actions\/workflows\/\.gitaction\.yml<\/url>/g" pom.xml
+	sed -i.bak 's/Travis CI/GitHub Actions/g' pom.xml
+	sed -i.bak "s;travis-ci.*;github.com/$repoSlug/actions/workflows/.gitaction.yml</url>;g" pom.xml
+	rm -f pom.xml.bak
 
 	# -- GitHub Action sanity checks --