Fix indentation error

c0000ff2 · van den Berg · f796a92b · c0000ff2
Commit c0000ff2 authored May 11, 2021 by van den Berg
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
      - name: Install singularity
        uses: eWaterCycle/setup-singularity@v6
        with:
-        singularity-version: 3.6.4
+          singularity-version: 3.6.4

      - name: Run test in conda environment
        # Use --symlink to limit disk usage.