Add test for release publisher

.github/workflows/test_release_publisher.yml

@@ -0,0 +1,39 @@
+name: "Test Release Publisher"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test_release_publisher:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    # Simulate the `fetch_release.py` script outputs by directly setting environment variables
+    - name: Mock fetch-release outputs
+      # TODO Parametrize all these and check results
+      #run: |
+        #echo "MICROMAMBA_NEW_VERSION=true" >> $GITHUB_ENV
+        #echo "MICROMAMBA_VERSION=1.1.0" >> $GITHUB_ENV
+        #echo "MICROMAMBA_NEW_PRERELEASE=false" >> $GITHUB_ENV
+        #echo "MICROMAMBA_LATEST=false" >> $GITHUB_ENV
+
+    #- name: Fake GitHub release
+      #uses: softprops/action-gh-release@v2.2.0
+      #if: env.MICROMAMBA_NEW_VERSION == 'true'
+      #with:
+        #name: Fake release
+        ## TODO use a PAT with write rights instead?
+        #token: ${{ secrets.GITHUB_TOKEN }}
+        ## Set 'draft' to true for testing
+        #draft: true
+        #prerelease: ${{ env.MICROMAMBA_NEW_PRERELEASE == 'true' }}
+        #make_latest: ${{ env.MICROMAMBA_LATEST }}
+        #body: |
+          #Fake release for micromamba
+        #tag_name: ${{ env.MICROMAMBA_VERSION }}
+        #files: |
+          #releases/*
+    ## TODO cleanup/remove the draft releases (once/twice a week?)