CI: Add LTS JDK 17 to the matrix; change skipping tests completely to only skip execution; restrict GH Actions permissions to bare minimum
CI: Add LTS JDK 17 to the matrix; change skipping tests completely to only skip execution; restrict GH Actions permissions to bare minimum

rhusar/JGroups,belaban/JGroups,rhusar/JGroups,rhusar/JGroups,pferraro/JGroups,belaban/JGroups,pferraro/JGroups,belaban/JGroups,pferraro/JGroups