feat(core): add output_condition option (#620) [skip ci]

source/plugins/core/README.md

@@ -203,6 +203,10 @@ It is possible to configure output behaviour using `output_action` option, which
 - `gist`, where output will be stored an already existing gist
   - To use this feature, a `gists` scope must be granted to your `token` and `committer_gist` identifier must be provided
 
+It also possible to alter output condition using `output_action` option, which can be set to:
+- `always`, to always push changes (provided that git sha changed)
+- `skip-if-only-metadata-changed`, to skip changes if only metadata contained in footer changed
+
 #### ℹ️ Examples workflows
 
 ```yaml

source/plugins/core/metadata.yml

@@ -94,6 +94,15 @@ inputs:
       - pull-request-rebase # Same as "pull-request" and additionaly rebase and merge pull request
       - gist                # Save output to "committer_gist"
 
+  # Output condition
+  output_condition:
+    description: Output condition
+    type: string
+    default: always
+    values:
+      - always                        # Always push changes
+      - skip-if-only-metadata-changed # Skip changes if only metadata contained in footer changed
+
   # Optimize SVG image to reduce its filesize
   # Some templates may not support this option
   optimize: