fix(ci): poetry cache post-step failure on release workflows (#10881)

.github/actions/setup-python-poetry/action.yml

@@ -22,6 +22,10 @@ inputs:
     description: 'Run `poetry lock` during setup. Only enable when a prior step mutates pyproject.toml (e.g. API `@master` VCS rewrite). Default: false.'
     required: false
     default: 'false'
+  enable-cache:
+    description: 'Whether to enable Poetry dependency caching via actions/setup-python'
+    required: false
+    default: 'true'
 
 runs:
   using: 'composite'
@@ -74,7 +78,9 @@ runs:
       uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0
       with:
         python-version: ${{ inputs.python-version }}
-        cache: 'poetry'
+        # Disable cache when callers skip dependency install: Poetry 2.3.4 creates
+        # the venv in a path setup-python can't hash, breaking the post-step save-cache.
+        cache: ${{ inputs.enable-cache == 'true' && 'poetry' || '' }}
         cache-dependency-path: ${{ inputs.working-directory }}/poetry.lock
 
     - name: Install Python dependencies