draft gitpod config

.gitpod-dockerfile

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+FROM gitpod/workspace-postgresql
+
+RUN sudo apt-get update \
+ && sudo apt-get install -y \
+    yarn \
+ && sudo rm -rf /var/lib/apt/lists/*
+
+RUN brew install just elixir 

.gitpod.yml

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+# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/config-gitpod-file)
+# and commit this file to your remote git repository to share the goodness with others.
+
+tasks:
+  - name: Setup
+    init: just setup
+    command: just dev