Update Gitpod Dockerfile

CHANGELOG.md

@@ -35,6 +35,7 @@
 - `bump_version` keeps now the indentation level of the updated version entries ([#2514](https://github.com/nf-core/tools/pull/2514))
 - Run tests with Python 3.12 ([#2522](https://github.com/nf-core/tools/pull/2522)).
 - Add mypy to pre-commit config for the tools repo ([#2545](https://github.com/nf-core/tools/pull/2545))
+- GitPod base image: swap tool installation back to `conda` from `mamba` ([#2566](https://github.com/nf-core/tools/pull/2566)).
 
 # [v2.10 - Nickel Ostrich](https://github.com/nf-core/tools/releases/tag/2.10) + [2023-09-25]
 

nf_core/gitpod/gitpod.Dockerfile

@@ -1,3 +1,6 @@
+# Test build locally before making a PR
+#   docker build -t gitpod:test -f nf_core/gitpod/gitpod.Dockerfile .
+
 FROM gitpod/workspace-base
 
 USER root
@@ -43,16 +46,16 @@ RUN conda config --add channels defaults && \
     conda config --add channels bioconda && \
     conda config --add channels conda-forge && \
     conda config --set channel_priority strict && \
-    conda install --quiet --yes --name base mamba && \
-    mamba install --quiet --yes --name base \
+    conda install --quiet --yes --name base \
+        mamba \
         nextflow \
         nf-core \
         nf-test \
         black \
         prettier \
         pre-commit \
         pytest-workflow && \
-    mamba clean --all -f -y
+    conda clean --all --force-pkgs-dirs --yes
 
 # Update Nextflow
 RUN nextflow self-update