build(spaceranger): Add initial dockerfile

Co-authored-by: Gisela Gabernet <gisela.gabernet@gmail.com>

modules/spaceranger/.gitignore

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+spaceranger-*.tar.gz

modules/spaceranger/Dockerfile

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+FROM continuumio/miniconda3:4.9.2
+LABEL authors="Gisela Gabernet <gisela.gabernet@gmail.com>,Edmund Miller <edmund.a.miller@gmail.com>" \
+    description="Docker image containing Space Ranger"
+# Disclaimer: this container is not provided nor supported by 10x Genomics.
+
+# Install procps and clean apt cache
+RUN apt-get update --allow-releaseinfo-change \
+    && apt-get install -y procps \
+    && apt-get clean -y && rm -rf /var/lib/apt/lists/*
+
+# Copy pre-downloaded spaceranger file
+ENV SPACERANGER_VER 1.3.0
+COPY spaceranger-$SPACERANGER_VER.tar.gz /opt/spaceranger-$SPACERANGER_VER.tar.gz
+
+# Install spaceranger
+RUN \
+    cd /opt && \
+    tar -xzvf spaceranger-$SPACERANGER_VER.tar.gz && \
+    export PATH=/opt/spaceranger-$SPACERANGER_VER:$PATH && \
+    ln -s /opt/spaceranger-$SPACERANGER_VER/spaceranger /usr/bin/spaceranger && \
+    rm -rf /opt/spaceranger-$SPACERANGER_VER.tar.gz

modules/spaceranger/README.md

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+# Updating the docker container and making a new module release
+
+Space Ranger is a commercial tool by 10X Genomics. The container provided for the spaceranger nf-core module is not provided nor supported by 10x Genomics. Updating the Space Ranger version in the container and pushing the update to Dockerhub needs to be done manually.
+
+1. Navigate to the [Space Ranger download page](https://support.10xgenomics.com/spatial-gene-expression/software/downloads/latest) and download the tar ball of the desired Space Ranger version with `curl` or `wget`. Place this file in the same folder where the Dockerfile lies.
+
+2. Edit the Dockerfile: update the Cell Ranger version in this line:
+
+    ```bash
+    ENV SPACERANGER_VER <VERSION>
+    ```
+
+3. Create the container:
+
+    ```bash
+    docker build . -t nfcore/spaceranger:<VERSION>
+    docker push nfcore/spaceranger:<VERSION>
+    ```