Add gist upload output action (#212)

source/plugins/core/README.md

@@ -153,7 +153,7 @@ Specify a single value to apply it to both height and with, and two values to us
     config_padding: 6%, 10% # 6% width padding, 10% height padding
 ```
 
-### 🧶 Using commits, pull requests or manual review to handle metrics output
+### 🧶 Using commits, pull requests, manual reviews or gists to handle metrics output
 
 It is possible to configure output behaviour using `output_action` option, which can be set to:
 - `none`, where output will be generated in `/rendered/${filename}` without being pushed
@@ -163,6 +163,8 @@ It is possible to configure output behaviour using `output_action` option, which
   - By appending either `-merge`, `-squash` or `-rebase`, pull request will be automatically merged with given method
   - This method is useful to combine all editions of a single run with multiples metrics steps into a single commit on targetted branch
   - If you choose to manually merge pull requests, be sure to disable `push:` triggers on your workflow, as it'll count as your own commit
+- `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
 
 #### ℹ️ Examples workflows
 

source/plugins/core/metadata.yml

@@ -52,6 +52,14 @@ inputs:
     type: string
     default: Update ${filename} - [Skip GitHub Action]
 
+  # Instead of saving metrics to a repository, it's possible to save them to a gist to avoid "commits pollution"
+  # Gist must be created prior and you must pass its identifier in the following option
+  # Set "gist" in "output_action" to use this option
+  committer_gist:
+    description: Gist used to store metrics
+    type: string
+    default: ""
+
   # Rendered metrics output path, relative to repository's root
   filename:
     description: Rendered metrics output path
@@ -83,6 +91,7 @@ inputs:
       - pull-request-merge  # Same as "pull-request" and additionaly merge pull request
       - pull-request-squash # Same as "pull-request" and additionaly squash and merge pull request
       - pull-request-rebase # Same as "pull-request" and additionaly rebase and merge pull request
+      - gist                # Save output to "committer_gist"
 
   # Optimize SVG image to reduce its filesize
   # Some templates may not support this option