Add 'load' input and default to false

If there are no steps following the build that require the image, the load is
pointless and may just delay the build with no real benefit.

Author: sairon

actions/build-image/action.yml

@@ -33,6 +33,10 @@ inputs:
     description: Whether to push images to registry
     required: false
     default: "false"
+  load:
+    description: Whether to load the built image into the Docker engine
+    required: false
+    default: "false"
   cache-gha:
     description: Whether to use GitHub Actions cache for build caching
     required: false
@@ -226,7 +230,7 @@ runs:
         file: ${{ steps.options.outputs.file }}
         pull: true
         push: ${{ inputs.push == 'true' }}
-        load: ${{ inputs.push != 'true' }}
+        load: ${{ inputs.load == 'true' }}
         build-args: ${{ steps.options.outputs.build_args }}
         tags: ${{ steps.options.outputs.tags }}
         outputs: ${{ steps.options.outputs.output }}