Use poetry cache workaround

.github/actions/build-action/action.yml

@@ -84,27 +84,29 @@ runs:
         echo "$HOME/.local/bin" >> $GITHUB_PATH
       shell: bash
 
-    # Don't cache until we can avoid collisions between arm64 and x64 caches
+    # Handle Poetry caching manually, based on the following workaround, until caches are keyed by architecture.
+    # https://github.com/actions/setup-python/issues/826#issuecomment-2021999109
     - name: Set up Python
-      if: ${{ env.RUNNER_ARCH }} != 'arm64'
       uses: actions/setup-python@v5
+      id: setup-python
       with:
         python-version: '3.11'
         architecture: ${{ env.RUNNER_ARCH }}
 
-    - name: Set up Python
-      if: ${{ env.RUNNER_ARCH }} == 'arm64'
-      uses: actions/setup-python@v5
-      with:
-        python-version: '3.11'
-        cache: poetry
-        cache-dependency-path: poetry.lock
-        architecture: ${{ env.RUNNER_ARCH }}
-
     - name: Install dependencies with Poetry
-      run: poetry install --no-dev
+      run: |
+        poetry install --no-dev
+        echo "POETRY_CACHE_DIR=$(poetry config cache-dir)" >> $GITHUB_ENV
       shell: bash
 
+    - name: Cache Poetry dependencies
+      uses: actions/cache@v4
+      with:
+        path: ${{ env.POETRY_CACHE_DIR }}
+        key: ${{ runner.os }}-poetry-${{ steps.setup-python.outputs.python-version }}-${{ env.RUNNER_ARCH }}-${{ hashFiles('**/poetry.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-poetry-${{ steps.setup-python.outputs.python-version }}-${{ env.RUNNER_ARCH }}
+
     - name: Use Node.js
       uses: actions/setup-node@v4
       with: