Allow the images input to be empty, which outputs just the raw tags

action.yml

@@ -13,7 +13,7 @@ inputs:
     required: true
   images:
     description: 'List of Docker images to use as base name for tags'
-    required: true
+    required: false
   tags:
     description: 'List of tags as key-value pair attributes'
     required: false

src/main.ts

@@ -15,10 +15,6 @@ actionsToolkit.run(
   // main
   async () => {
     const inputs: Inputs = getInputs();
-    if (inputs.images.length == 0) {
-      throw new Error(`images input required`);
-    }
-
     const toolkit = new Toolkit({githubToken: inputs.githubToken});
     const context = await getContext(inputs.context);
     const repo = await toolkit.github.repoData();

src/meta.ts

@@ -441,14 +441,26 @@ export class Meta {
       return [];
     }
     const tags: Array<string> = [];
-    for (const imageName of this.getImageNames()) {
-      tags.push(`${imageName}:${this.version.main}`);
+    const images = this.getImageNames();
+    if (Array.isArray(images) && images.length) {
+      for (const imageName of images) {
+        tags.push(`${imageName}:${this.version.main}`);
+        for (const partial of this.version.partial) {
+          tags.push(`${imageName}:${partial}`);
+        }
+        if (this.version.latest) {
+          const latestTag = `${this.flavor.prefixLatest ? this.flavor.prefix : ''}latest${this.flavor.suffixLatest ? this.flavor.suffix : ''}`;
+          tags.push(`${imageName}:${Meta.sanitizeTag(latestTag)}`);
+        }
+      }
+    } else {
+      tags.push(this.version.main);
       for (const partial of this.version.partial) {
-        tags.push(`${imageName}:${partial}`);
+        tags.push(partial);
       }
       if (this.version.latest) {
         const latestTag = `${this.flavor.prefixLatest ? this.flavor.prefix : ''}latest${this.flavor.suffixLatest ? this.flavor.suffix : ''}`;
-        tags.push(`${imageName}:${Meta.sanitizeTag(latestTag)}`);
+        tags.push(Meta.sanitizeTag(latestTag));
       }
     }
     return tags;