add workflow to release docker image to github package

Author: ks6088ts

.github/workflows/ghcr-release.yaml

@@ -0,0 +1,47 @@
+name: ghcr
+on:
+  push:
+    tags:
+      - "v*"
+env:
+  IMAGE_NAME: template-go
+jobs:
+  ghcr:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set Versions
+        uses: actions/github-script@v7
+        id: set_version
+        with:
+          script: |
+            const tag = context.ref.substring(10)
+            const no_v = tag.replace('v', '')
+            const dash_index = no_v.lastIndexOf('-')
+            const no_dash = (dash_index > -1) ?  no_v.substring(0, dash_index) : no_v
+            core.setOutput('tag', tag)
+            core.setOutput('no-v', no_v)
+            core.setOutput('no-dash', no_dash)
+      - name: Set meta data tag = ${{steps.set_version.outputs.no-dash}}
+        uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}},value=v${{steps.set_version.outputs.no-dash}}
+            type=raw,value=latest
+      - uses: docker/build-push-action@v5
+        with:
+          push: true
+          context: .
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

README.md

@@ -5,6 +5,7 @@
 
 [![docker](https://github.com/ks6088ts/template-go/actions/workflows/docker.yaml/badge.svg?branch=main)](https://github.com/ks6088ts/template-go/actions/workflows/docker.yaml?query=branch%3Amain)
 [![docker-release](https://github.com/ks6088ts/template-go/actions/workflows/docker-release.yaml/badge.svg)](https://github.com/ks6088ts/template-go/actions/workflows/docker-release.yaml)
+[![ghcr-release](https://github.com/ks6088ts/template-go/actions/workflows/ghcr-release.yaml/badge.svg)](https://github.com/ks6088ts/template-go/actions/workflows/ghcr-release.yaml)
 
 # template-go