chore(release): release on separate branch with changelog

src/docker.ts

@@ -2,13 +2,14 @@ class Docker {
   readonly repository = 'renovate/renovate';
   // renovate: datasource=docker depName=renovate/renovate versioning=docker
   readonly tag = '19.234.1-slim';
+  readonly tagSuffix = '-slim';
 
   image(): string {
     return `${this.repository}:${this.tag}`;
   }
 
   version(): string {
-    return this.tag;
+    return this.tag.replace(this.tagSuffix, '');
   }
 }
 

src/get-version.ts

@@ -0,0 +1,5 @@
+import * as core from '@actions/core';
+import Docker from './docker';
+
+const docker = new Docker();
+core.setOutput('version', docker.version());