added postgres to docker & added to readme

.devcontainer/backend/Dockerfile

@@ -56,4 +56,11 @@ https://apt.releases.hashicorp.com $(lsb_release -cs) main" | \
 tee /etc/apt/sources.list.d/hashicorp.list
 RUN apt update
 RUN apt-get install terraform
-RUN terraform -install-autocomplete
+RUN terraform -install-autocomplete
+
+# Install postgres
+RUN apt install -y wget gnupg2 lsb-release
+RUN echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" | sudo tee /etc/apt/sources.list.d/pgdg.list
+RUN wget -qO - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
+RUN apt update
+RUN apt install -y postgresql-14

backend/export/README.md

@@ -15,6 +15,20 @@ without modifying test code.
 
 ## ✅ Prerequisites
 
+### Devcontainer
+
+Postgres install is included in the devcontainer, so no additional setup is needed.
+
+Running
+
+```bash
+make test
+```
+
+Will instigate the test suite, which will automatically start a temporary PostgreSQL instance.
+
+### Local MacOS
+
 1. Install PostgreSQL via Homebrew:
 
 ``` bash