Cleanup codestyle workflow (#2860)

remove redundant environment setup steps with setup_env action

.github/workflows/codestyle.yml

@@ -32,24 +32,10 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
-
-      - name: Download Lock File
-        run:  wget -q https://raw.githubusercontent.com/tardis-sn/tardis/master/conda-linux-64.lock
-
-      - name: Generate Cache Key
-        run: | 
-          file_hash=$(cat conda-linux-64.lock | shasum -a 256 | cut -d' ' -f1)
-          echo "file_hash=$file_hash" >> "${GITHUB_OUTPUT}"
-        id: cache-environment-key
-
-      - uses: mamba-org/setup-micromamba@v1
+      - name: Setup environment
+        uses: ./.github/actions/setup_env
         with:
-          environment-file: conda-linux-64.lock
-          cache-environment-key: ${{ steps.cache-environment-key.outputs.file_hash }}
-          cache-downloads-key: ${{ steps.cache-environment-key.outputs.file_hash }}
-          environment-name: tardis
-          cache-environment: true
-          cache-downloads: true
+            os-label: linux-64
 
       - name: Show statistics pull request
         if: github.event_name == 'pull_request_target'