Build images only when they change (#146)

* GHA: build images on change only

* GHA has ended macos-12 support

* allow manual builds via Actions UI

---------

Co-authored-by: Alec Reynolds <[email protected]>

Author: AaronFeledy

Diff for: .github/workflows/build-php-images.yml

@@ -1,11 +1,17 @@
 name: Build PHP Images
 
 on:
-  # Uncomment below for testing purposes
   pull_request:
+    paths:
+      - 'images/**'
+      - '.github/workflows/build-php-images.yml'
   push:
     branches:
       - main
+    paths:
+      - 'images/**'
+      - '.github/workflows/build-php-images.yml'
+  workflow_dispatch:
 
 jobs:
   buildx:

Diff for: CHANGELOG.md

@@ -1,5 +1,7 @@
 ## {{ UNRELEASED_VERSION }} - [{{ UNRELEASED_DATE }}]({{ UNRELEASED_LINK }})
 
+* Updated GitHub Actions to build images only on changes to images or workflows.
+
 ## v1.6.1 - [November 4, 2024](https://github.com/lando/php/releases/tag/v1.6.1)
 
 * Updated to [@lando/vitepress-theme-default-plus@v1.1.0-beta.18](https://github.com/lando/vitepress-theme-default-plus/releases/tag/v1.1.0-beta.18).