fix: env update trigger from #1049 (#1281)

* Update update-fixed-env.yaml

* Update update-fixed-env.yaml

* Update update-fixed-env.yaml

* handle reuse

* fix

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update update-fixed-env.yaml

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/update-fixed-env.yaml

@@ -1,39 +1,39 @@
-name: Fixed Environment YAML Monitor
+name: Fixed-Version Environment Checker
 
 on:
   push:
     branches:
     - master
     paths:
-    - 'env/environment.yaml'
+    - 'envs/environment.yaml'
 
 jobs:
-  update_environment_fixed:
+  update-environment-fixed:
+    name: Update environment.fixed.yaml
     runs-on: ubuntu-latest
 
     steps:
-    - name: Checkout Repository
-      uses: actions/checkout@v4
+    - uses: actions/checkout@v4
 
-    - name: Setup micromamba
-      uses: mamba-org/setup-micromamba@v1
+    - name: Setup conda
+      uses: conda-incubator/setup-miniconda@v3
       with:
-        micromamba-version: latest
+        activate-environment: pypsa-eur
         environment-file: envs/environment.yaml
-        log-level: debug
-        init-shell: bash
-        cache-environment: true
-        cache-downloads: true
 
     - name: Update environment.fixed.yaml
       run: |
-        mamba env export --file envs/environment.fixed.yaml  --no-builds
+        conda env export --name pypsa-eur --no-builds > envs/environment.fixed.yaml
+
+    - name: Add SPDX header
+      run: |
+        SPDX_HEADER="# SPDX-FileCopyrightText: : 2017-2024 The PyPSA-Eur Authors\n# SPDX-License-Identifier: CC0-1.0\n"
+        echo -e "$SPDX_HEADER" | cat - envs/environment.fixed.yaml > temp && mv temp envs/environment.fixed.yaml
 
     - name: Create Pull Request
       uses: peter-evans/create-pull-request@v7
       with:
         token: ${{ secrets.GITHUB_TOKEN }}
         branch: update-environment-fixed
-        title: Update fixed environment
-        body: Automatically generated PR to update environment.fixed.yaml
-        labels: automated
+        title: "[github-actions.ci] Update fixed environment"
+        body: Automatically generated PR to update environment.fixed.yaml, since environment.yaml was updated.