feat: build on pull request as well as release

This change adds "pull_request" as an event that will trigger the workflow.
Additionally, it alters the "Build and push" step such that the "push" value will be based on whether or not this is for a release.

Signed-off-by: Matthew Weier O'Phinney <[email protected]>

Author: weierophinney

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

@@ -3,6 +3,7 @@ name: Build and push containers
 on:
   release:
     types: [published]
+  pull_request:
 
 jobs:
   release-container:
@@ -41,7 +42,7 @@ jobs:
           file: ./Dockerfile
           platforms: linux/amd64
           pull: true
-          push: true
+          push: ${{ github.event_name == 'release' }}
           tags: ${{ join(fromJSON(steps.tags.outputs.tags), ',') }}
           cache-from: type=registry,ref=ghcr.io/laminas/laminas-continuous-integration-action:build-cache
           cache-to: type=registry,ref=ghcr.io/laminas/laminas-continuous-integration-action:build-cache,mode=max