Try publishing a package

.github/workflows/ci.yaml

@@ -1,6 +1,6 @@
 ---
 
-name: Build Docker image
+name: Build and publish Docker image
 
 env:
   POSTGRES_VERSION: "15.3"
@@ -13,11 +13,25 @@ on:
   workflow_dispatch:
 
 jobs:
-  build-image:
+  build-and-publish-image:
     runs-on: ubuntu-latest
+    permissions:
+      packages: write
     steps:
       - uses: actions/checkout@v4
 
+      - name: Login to the container registry
+        uses: docker/login-action@v3
+        with:
+          registry: https://ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Build image
         run: |
           docker build --build-arg="POSTGRES_VERSION=${POSTGRES_VERSION}" --build-arg="PGVECTOR_VERSION=${PGVECTOR_VERSION}" --tag "ghcr.io/zapgram/cimg-postgres-pgvector:${POSTGRES_VERSION}-${PGVECTOR_VERSION}" .
+
+      - name: Publish image
+        if: github.ref_name == 'trunk'
+        run: |
+          docker push "ghcr.io/zapgram/cimg-postgres-pgvector:${POSTGRES_VERSION}-${PGVECTOR_VERSION}"