CLDC-NONE: Add dev container to access infrastructure (#3135)

* CLDC-NONE: Add dev container to access infrastructure

* CORE-NONE: Add internal wiki link

aws-devcontainer/.devcontainer/Dockerfile

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+FROM homebrew/brew
+
+RUN brew install aws-vault && brew install awscli
+RUN curl "https://s3.amazonaws.com/session-manager-downloads/plugin/latest/ubuntu_64bit/session-manager-plugin.deb" -o "session-manager-plugin.deb" && sudo dpkg -i session-manager-plugin.deb
+
+ENV AWS_VAULT_BACKEND=file
+ENV AWS_VAULT_FILE_DIR=./vault
+ENV AWS_CONFIG_FILE=./config

aws-devcontainer/.devcontainer/devcontainer.json

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+{
+  "name": "CORE aws-vault",
+  "build": {
+    "dockerfile": "Dockerfile"
+  }
+}

aws-devcontainer/.gitignore

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+config
+vault/*

aws-devcontainer/README.md

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+# CORE AWS/AWS-vault dev container
+
+Sets up aws CLI & aws-vault CLI, as well as config storage.
+
+See [internal documentation](https://softwiretech.atlassian.net/wiki/spaces/Support/pages/21648277643/CORE+AWS+Tasks#Accessing-a-database) for further description on configuring this with our infrastructure.

aws-devcontainer/config.template

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+[default]
+region=eu-west-2
+output=json