Make debian package setup example more self explained

templates/package/content/debian.tmpl

@@ -4,8 +4,14 @@
 		<div class="ui form">
 			<div class="field">
 				<label>{{svg "octicon-terminal"}} {{ctx.Locale.Tr "packages.debian.registry"}}</label>
-				<div class="markup"><pre class="code-block"><code>sudo curl <origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/debian/repository.key"></origin-url> -o /etc/apt/keyrings/gitea-{{$.PackageDescriptor.Owner.Name}}.asc
-echo "deb [signed-by=/etc/apt/keyrings/gitea-{{$.PackageDescriptor.Owner.Name}}.asc] <origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/debian"></origin-url> $distribution $component" | sudo tee -a /etc/apt/sources.list.d/gitea.list
+				<div class="markup"><pre class="code-block"><code>{{ if gt (len .Distributions) 1 }}# please select one:
+DISTRIBUTION="" # {{StringUtils.Join .Distributions ", "}}
+
+{{end}}{{ if gt (len .Components) 1 }}# please select one:
+COMPONENT="" # {{StringUtils.Join .Components ", "}}
+
+{{end}}sudo curl <origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/debian/repository.key"></origin-url> -o /etc/apt/keyrings/gitea-{{$.PackageDescriptor.Owner.Name}}.asc
+echo "deb [signed-by=/etc/apt/keyrings/gitea-{{$.PackageDescriptor.Owner.Name}}.asc] <origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/debian"></origin-url> {{ if eq (len .Distributions) 1 }}{{ index .Distributions 0 }}{{else}}$DISTRIBUTION{{end}} {{ if eq (len .Components) 1 }}{{ index .Components 0 }}{{else}}$COMPONENT{{end}}" | sudo tee -a /etc/apt/sources.list.d/gitea.list
 sudo apt update</code></pre></div>
 				<p>{{ctx.Locale.Tr "packages.debian.registry.info"}}</p>
 			</div>