Add tag justfile command

Author: ConradMearns

justfile

@@ -87,4 +87,7 @@ tutorials-check:
 
 install-completions:
     mkdir -p $HOME/.local/share/bash-completion
-    just --completions bash > $HOME/.local/share/bash-completion/just.bash
+    just --completions bash > $HOME/.local/share/bash-completion/just.bash
+
+tag tag:
+    git tag {{tag}}; git push origin {{tag}}