Refactor build pipeline to reduce duplicate builds (#778)

Author: leighmcculloch

.github/actions/push/action.yml

@@ -7,6 +7,10 @@ on:
         description: 'Tag to use'
         type: 'string'
         default: ''
+      artifact:
+        description: 'Artifact to use'
+        type: 'string'
+        default: ''
 
 jobs:
   action-setup:
@@ -32,7 +36,12 @@ jobs:
       with:
         script: |
           const os = ['ubuntu-latest'];
-          if (process.env.ACTION_CHANGED === 'true') {
+          // Only run the additional builds if the action has changed, and this
+          // is not a test with an artifact image. The additional runs are time
+          // consuming so only do them if necessary. Don't run them for artifact
+          // action tests because the test won't be multiplatform since the
+          // artifact images contain only a single platform.
+          if (process.env.ACTION_CHANGED === 'true' && '${{ inputs.artifact }}' === '') {
             os.push('ubuntu-24.04-arm');
             os.push('macos-13');
           }
@@ -50,6 +59,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: ./
       with:
+        artifact: ${{ inputs.artifact }}
         tag: ${{ inputs.tag }}
     - name: "Run basic test making sure RPC and Horizon are available"
       run: >