fix: create fstab in roledir to make sure there are no permission issues, and ignore it in git

.gitignore

@@ -86,3 +86,4 @@ iso/
 # time new systems should be installed. Hence, it's not suitable for version
 # control.
 vars/network.yml
+fstab

tasks/main.yml

@@ -19,7 +19,7 @@
     opts: "loop"
     path: "{{ playbook_dir }}/iso/"
     src: "{{ playbook_dir }}/rhel-server-{{ rhel_version_long }}-x86_64-dvd.iso"
-    fstab: "/tmp/fstab"
+    fstab: "{{ playbook_dir }}/fstab"
     state: mounted
 # Copy contents of ISO image to the build directory, because they will need to
 # be included in the new image.