Deprecate env add in favor of env set

Change-type: patch

docs/balena-cli.md

@@ -2406,7 +2406,7 @@ do not prompt for confirmation before deleting the variable
 
 ### Aliases
 
-- `env add`
+- `env add` *(deprecated)*
 
 
 To use one of the aliases, replace `env set` with the alias.

src/commands/env/set.ts

@@ -37,6 +37,7 @@ interface ArgsDef {
 
 export default class EnvSetCmd extends Command {
 	public static aliases = ['env add'];
+	public static deprecateAliases = true;
 
 	public static description = stripIndent`
 		Add or update env or config variable to fleets, devices or services.