doas: add page (#3939)

pages/common/doas.md

@@ -0,0 +1,24 @@
+# doas
+
+> Executes a command as another user.
+> More information: <https://man.openbsd.org/doas>.
+
+- Run a command as root:
+
+`doas {{command}}`
+
+- Run a command as another user:
+
+`doas -u {{user}} {{command}}`
+
+- Launch the default shell as root:
+
+`doas -s`
+
+- Parse a config file and check if the execution of a command as another user is allowed:
+
+`doas -C {{config_file}} {{command}}`
+
+- Make `doas` request a password even after it was supplied earlier:
+
+`doas -L`