Add CHANGELOG for release v11

Also add a little more documentation for
#29

CHANGELOG.md

@@ -1,3 +1,9 @@
+## run-fourmolu v11
+
+*   Add a new `working-directory` argument that allows you to change the
+    working directory that `fourmolu` is run from.
+    [#29](https://github.com/haskell-actions/run-fourmolu/pull/29)
+
 ## run-fourmolu v10
 
 *   Upgrade `run-formolu` to work with Node 20 instead of Node 16.

README.md

@@ -86,6 +86,9 @@ Here's a more complicated example that shows more options being used:
 
     # Extra args to pass to fourmolu on the command line.
     extra-args: "--indent-wheres true"
+
+    # Change to the ./my-haskell-code/ directory before running this action.
+    working-directory: "./my-haskell-code"
 ```
 
 See [docs](https://github.com/actions/toolkit/tree/main/packages/glob#patterns) on pattern syntax.

action.yml

@@ -40,7 +40,11 @@ inputs:
     default: latest
   working-directory:
     description: >
-      Directory to run Fourmolu.
+      Directory in which to run Fourmolu.  This also affects how the `pattern`
+      argument is interpretted, with Glob patterns being relative to this
+      `working-directory` argument.
+
+      Defaults to the repository root if not set.
     required: false
 runs:
   using: 'node20'