Only push image on published releases (#5)

Signed-off-by: Yuri Shkuro <github@ysh.us>

Author: yurishkuro

.github/workflows/build-and-push.yml

@@ -5,6 +5,8 @@ on:
     branches: [ main ]
   pull_request:
     branches: [ main ]
+  release:
+    types: [ published ]
   workflow_dispatch:
 
 env:
@@ -29,7 +31,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log in to the Container registry
-        if: github.event_name != 'pull_request'
+        if: github.event_name == 'release'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
@@ -52,7 +54,7 @@ jobs:
         with:
           context: .
           platforms: linux/amd64,linux/arm64,linux/s390x,linux/ppc64le
-          push: ${{ github.event_name != 'pull_request' }}
+          push: ${{ github.event_name == 'release' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha

README.md

@@ -17,10 +17,16 @@ FROM ghcr.io/jaegertracing/base-image-with-debugger:latest
 # ... your build steps ...
 ```
 
+## Releases
+
+The container image is only pushed on published GitHub Releases.
+
 ## Maintenance
 
 The versions of the base image and Delve are managed by Renovate.
 
+https://developer.mend.io/github/jaegertracing/base-image-with-debugger
+
 ## Local Development
 
 You can build the image locally using the provided `Makefile`: