feat: consistent flags and environment variables (#5549)

- In the root command, all flags are now correctly available as environmental variables, except for `--config` flag. This was already supposed to be the case, but due to bugs in the implementation it didn't work properly.
- All configuration options (unless I missed something) that are available as flags should now properly update the configuration when using the `config init` and `config set` commands.
- Flag names are now consistently in the lowerCamelCase format. All flags that were in a different format have been updated in a backwards compatible way. For a transitionary period of at least 6 months, both will work:
  - `--dir-mode` --> `--dirMode`
  - `--hide-login-button` --> `--hideLoginButton`
  - `--create-user-dir` --> `--createUserDir`
  - `--minimum-password-length` --> `--minimumPasswordLength`
  - `--socket-perm` --> `--socketPerm`
  - `--disable-thumbnails` --> `--disableThumbnails`
  - `--disable-preview-resize` --> `--disablePreviewResize`
  - `--disable-exec` --> `--disableExec`
  - `--disable-type-detection-by-header` --> `--disableTypeDetectionByHeader`
  - `--img-processors` --> `--imageProcessors`
  - `--cache-dir` --> `--cacheDir`
  - `--token-expiration-time` --> `--tokenExpirationTime`
  - `--baseurl` --> `--baseURL`

cmd/users_add.go

@@ -17,11 +17,12 @@ var usersAddCmd = &cobra.Command{
 	Long:  `Create a new user and add it to the database.`,
 	Args:  cobra.ExactArgs(2),
 	RunE: python(func(cmd *cobra.Command, args []string, d *pythonData) error {
+		flags := cmd.Flags()
 		s, err := d.store.Settings.Get()
 		if err != nil {
 			return err
 		}
-		err = getUserDefaults(cmd.Flags(), &s.Defaults, false)
+		err = getUserDefaults(flags, &s.Defaults, false)
 		if err != nil {
 			return err
 		}
@@ -31,27 +32,24 @@ var usersAddCmd = &cobra.Command{
 			return err
 		}
 
-		lockPassword, err := getBool(cmd.Flags(), "lockPassword")
-		if err != nil {
-			return err
-		}
-
-		dateFormat, err := getBool(cmd.Flags(), "dateFormat")
-		if err != nil {
-			return err
-		}
-
-		hideDotfiles, err := getBool(cmd.Flags(), "hideDotfiles")
-		if err != nil {
-			return err
-		}
-
 		user := &users.User{
-			Username:     args[0],
-			Password:     password,
-			LockPassword: lockPassword,
-			DateFormat:   dateFormat,
-			HideDotfiles: hideDotfiles,
+			Username: args[0],
+			Password: password,
+		}
+
+		user.LockPassword, err = flags.GetBool("lockPassword")
+		if err != nil {
+			return err
+		}
+
+		user.DateFormat, err = flags.GetBool("dateFormat")
+		if err != nil {
+			return err
+		}
+
+		user.HideDotfiles, err = flags.GetBool("hideDotfiles")
+		if err != nil {
+			return err
 		}
 
 		s.Defaults.Apply(user)