Generate latest tag by default on push tag event (#5)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

README.md

@@ -23,6 +23,7 @@ ___
   * [inputs](#inputs)
   * [outputs](#outputs)
 * [Notes](#notes)
+  * [Latest tag](#latest-tag)
   * [`tag-match` examples](#tag-match-examples)
   * [Schedule tag](#schedule-tag)
   * [Overwrite labels](#overwrite-labels)
@@ -42,10 +43,9 @@ ___
 |-----------------|-------------------------------|------------|-------------------------------------|
 | `schedule`      | `refs/heads/master`           | `45f132a`  | `sha-45f132a`, `nightly`            |
 | `pull_request`  | `refs/pull/2/merge`           | `a123b57`  | `sha-a123b57`, `pr-2`               |
-| `push`          | `refs/heads/<default_branch>` | `676cae2`  | `sha-676cae2`, `edge`               |
-| `push`          | `refs/heads/dev`              | `cf20257`  | `sha-cf20257`, `dev`                |
+| `push`          | `refs/heads/master`           | `cf20257`  | `sha-cf20257`, `master`             |
 | `push`          | `refs/heads/my/branch`        | `a5df687`  | `sha-a5df687`, `my-branch`          |
-| `push tag`      | `refs/tags/v1.2.3`            | `bf4565b`  | `sha-bf4565b`, `1.2.3`, `latest`    |
+| `push tag`      | `refs/tags/v1.2.3`            | `bf4565b`  | `sha-bf4565b`, `v1.2.3`, `latest`   |
 | `push tag`      | `refs/tags/mytag`             | `afb7833`  | `sha-afb7833`, `mytag`              |
 
 ## Usage
@@ -76,10 +76,6 @@ jobs:
         uses: crazy-max/ghaction-docker-meta@v1
         with:
           images: name/app
-          tag-sha: true
-          tag-edge: true
-          tag-match: 'v(.*)'
-          tag-match-group: '1'
       -
         name: Set up QEMU
         uses: docker/setup-qemu-action@v1
@@ -138,6 +134,12 @@ Following outputs are available
 
 ## Notes
 
+### Latest tag
+
+Latest Docker tag will be generated by default on `push tag` event. So if for example you push the `v1.2.3` Git tag,
+you will have at the output of this action the Docker tags `v1.2.3` and `latest`. But you can allow the latest tag to be
+generated only if the Git tag matches a regular expression with the [`tag-match` input](#tag-match-examples).
+
 ### `tag-match` examples
 
 | Git tag                 | `tag-match`                        | `tag-match-group` | Docker tag

__tests__/meta.test.ts

@@ -377,10 +377,11 @@ describe('push tag', () => {
       } as Inputs,
       {
         version: 'release1',
-        latest: false
+        latest: true
       } as Version,
       [
-        'user/app:release1'
+        'user/app:release1',
+        'user/app:latest'
       ],
       [
         "org.opencontainers.image.title=Hello-World",
@@ -400,10 +401,11 @@ describe('push tag', () => {
       } as Inputs,
       {
         version: '20200110-RC2',
-        latest: false
+        latest: true
       } as Version,
       [
-        'user/app:20200110-RC2'
+        'user/app:20200110-RC2',
+        'user/app:latest'
       ],
       [
         "org.opencontainers.image.title=Hello-World",
@@ -686,11 +688,13 @@ describe('latest', () => {
       } as Inputs,
       {
         version: 'v1.1.1',
-        latest: false
+        latest: true
       } as Version,
       [
         'org/app:v1.1.1',
+        'org/app:latest',
         'ghcr.io/user/app:v1.1.1',
+        'ghcr.io/user/app:latest',
       ],
       [
         "org.opencontainers.image.title=Hello-World",
@@ -951,10 +955,11 @@ describe('release', () => {
       } as Inputs,
       {
         version: 'v1.1.1',
-        latest: false
+        latest: true
       } as Version,
       [
         'user/app:v1.1.1',
+        'user/app:latest',
       ],
       [
         "org.opencontainers.image.title=Hello-World",

src/meta.ts

@@ -52,6 +52,8 @@ export class Meta {
           version.version = tagMatch[this.inputs.tagMatchGroup];
           version.latest = this.inputs.tagMatchLatest;
         }
+      } else {
+        version.latest = true;
       }
     } else if (/^refs\/heads\//.test(this.context.ref)) {
       version.version = this.context.ref.replace(/^refs\/heads\//g, '').replace(/\//g, '-');