Custom Dockerfile for gitpod.io

Little configuration to give https://gitpod.io users an environment with the SDKs pre-installed

.gitpod.yml

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+image:
+  file: docker/.gitpod.Dockerfile
+github:
+  prebuilds:
+    # enable for the master/default branch (defaults to true)
+    master: true
+    # enable for all branches in this repo (defaults to false)
+    branches: false
+    # enable for pull requests coming from this repo (defaults to true)
+    pullRequests: false
+    # enable for pull requests coming from forks (defaults to false)
+    pullRequestsFromForks: false
+    # add a "Review in Gitpod" button as a comment to pull requests (defaults to true)
+    addComment: true
+    # add a "Review in Gitpod" button to pull requests (defaults to false)
+    addBadge: false
+    # add a label once the prebuild is ready to pull requests (defaults to false)
+    addLabel: false #prebuilt-in-gitpod

docker/.gitpod.Dockerfile

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+FROM gitpod/workspace-full
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update -qq \
+    && apt-get install -y \
+# x86_64 / generic packages
+      bash \
+      build-essential \
+      cmake \
+      git \
+      make \
+      python3 \
+      python3-pip \
+      tar \
+      unzip \
+      wget \ 
+# aarch64 packages
+      libffi-dev \
+      libssl-dev \
+      python3-dev \ 
+    && rm -rf /var/cache/apt/* /var/lib/apt/lists/*;
+
+# Needs to be installed as root
+RUN pip3 install adafruit-nrfutil
+
+RUN sudo chown -R gitpod /opt
+
+COPY docker/build.sh /opt/
+# Lets get each in a separate docker layer for better downloads
+# GCC
+RUN bash -c "source /opt/build.sh; GetGcc;"
+# NrfSdk
+RUN bash -c "source /opt/build.sh; GetNrfSdk;"
+# McuBoot
+RUN bash -c "source /opt/build.sh; GetMcuBoot;"
+
+# Link the default checkout workspace in to the default $SOURCES_DIR
+RUN sudo ln -s /workspace/Pinetime /sources