Publish an image to ghcr.io on release

.github/workflows/publish.yml

@@ -7,6 +7,10 @@ on:
 permissions:
   contents: read
 
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
 jobs:
   docs:
     runs-on: ubuntu-latest
@@ -248,7 +252,7 @@ jobs:
         name: python-packages
         path: dist/
 
-  publish:
+  publish-pypi:
     name: Publish to PyPI
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/')
@@ -264,3 +268,49 @@ jobs:
         path: dist/
     - name: Publish to PyPI
       uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # v1.14.2
+
+  publish-image:
+    name: Publish to ghcr.io
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: [build]
+    environment: release
+
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+    - name: Log in to the Container registry
+      uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+    - name: Build and push Docker image
+      id: push
+      uses: docker/build-push-action@53b7df96c91f9c12dcc8a07bcb9ccacbed38856a # v7.3.0
+      with:
+        context: .
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+
+    - name: Generate artifact attestation
+      uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4.2.2
+      with:
+        subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+        subject-digest: ${{ steps.push.outputs.digest }}
+        push-to-registry: true

changelog.md

@@ -4,6 +4,7 @@ Upcoming (TBD)
 Features
 --------
 * Allow `/tee` and `/once` to complete on any file extension.
+* Publish an image to ghcr.io on release.
 
 
 Bug Fixes