Initial

.github/workflows/release.yml

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+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./

LICENSE

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+The MIT License (MIT)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# additional-tags-action
+
+**A [GitHub Action](https://github.com/features/actions) to create major and minor git tags from the last tag.**
+
+![GitHub tag](https://img.shields.io/github/v/tag/vweevers/additional-tags-action?sort=semver)
+[![License](https://img.shields.io/github/license/vweevers/additional-tags-action)](LICENSE)
+
+## Usage
+
+```yaml
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: vweevers/additional-tags-action@v1
+```
+
+If your tag is `v2.4.8` (for example) then this action will create 2 additional tags (`v2` and `v2.4`) and push them to GitHub, replacing existing tags. If the tag is a prerelease (not x.x.x) or not prefixed with `v` then nothing happens.
+
+## Why
+
+Useful to release actions. Consumers of your action can now pin to either a:
+
+- Major version (`uses: my-action@v2`)
+- Minor version (`uses: [email protected]`)
+- Exact version (`uses: [email protected]`)
+
+## Inputs
+
+None.
+
+## License
+
+[MIT](LICENSE)

action.yml

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+name: Additional Tags
+description: Create major and minor git tags from the last tag
+runs:
+  using: node12
+  main: index.js

index.js

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+'use strict'
+
+const { execFileSync } = require('child_process')
+
+try {
+  const maxBuffer = 1024 * 1024 * 16
+  const tags = execFileSync('git', ['tag'], { maxBuffer, encoding: 'utf8' })
+  const tag = tags.split(/\r?\n/).filter(Boolean).pop()
+
+  if (!tag) {
+    // Nothing to do
+  } else if (!/^v\d+\.\d+\.\d+$/.test(tag)) {
+    console.log('Skipping tag %s', tag)
+  } else {
+    const [major, minor] = tag.slice(1).split('.')
+    const majorTag = 'v' + major
+    const minorTag = 'v' + major + '.' + minor
+
+    execFileSync('git', ['config', 'user.name', 'github-actions'])
+    execFileSync('git', ['config', 'user.email', '[email protected]'])
+    execFileSync('git', ['tag', '-fa', majorTag, '-m', majorTag])
+    execFileSync('git', ['tag', '-fa', minorTag, '-m', minorTag])
+    execFileSync('git', ['push', '--tags', '-f'])
+  }
+} catch (err) {
+  console.log('::error::%s', err.message || String(err))
+  process.exit(1)
+}