fix: set channel priority in container system wide (#1690)

Dockerfile

@@ -8,7 +8,7 @@ ENV SHELL /bin/bash
 RUN install_packages wget curl bzip2 ca-certificates gnupg2 squashfs-tools git
 RUN /bin/bash -c "curl -L https://github.com/conda-forge/miniforge/releases/latest/download/Mambaforge-Linux-x86_64.sh > mambaforge.sh && \
     bash mambaforge.sh -b -p /opt/conda && \
-    conda config --set channel_priority strict && \
+    conda config --system --set channel_priority strict && \
     rm mambaforge.sh"
 RUN /bin/bash -c "mamba create -q -y -c conda-forge -c bioconda -n snakemake snakemake snakemake-minimal --only-deps && \
     source activate snakemake && \