Add cache option to setup action

CHANGES.rst

@@ -32,6 +32,7 @@ Release History
 - Added ``gpl-v2`` license type. (`#192`_)
 - Added ``isort_exclude`` option to the ``pyproject_toml`` config, which 
   can be used by ``isort`` to skip files or directories via regex patterns. (`#196`_)
+- Added ``cache=False`` option to ``setup`` action. (`#198`_)
 
 **Changed**
 
@@ -70,6 +71,7 @@ Release History
 .. _#191: https://github.com/nengo/nengo-bones/pull/191
 .. _#192: https://github.com/nengo/nengo-bones/pull/192
 .. _#196: https://github.com/nengo/nengo-bones/pull/196
+.. _#198: https://github.com/nengo/nengo-bones/pull/198
 
 22.11.15 (November 15, 2022)
 ============================

actions/setup/action.yml

@@ -9,6 +9,10 @@ inputs:
     description: Python version (passed to actions/setup-python)
     required: false
     default: "3"
+  cache:
+    description: Enable/disable caching of pip/conda downloads
+    required: false
+    default: "true"
 runs:
   using: composite
   steps:
@@ -19,9 +23,10 @@ runs:
       with:
         create-args: python=${{ inputs.python-version }}
         environment-name: ci
-        cache-downloads: true
+        cache-downloads: ${{ inputs.cache }}
         generate-run-shell: false
     - uses: actions/cache@v4
+      if: ${{ inputs.cache == 'true' }}
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip