add docker structure test config

tests/README-tests.md

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+# Docker Image Structural Testing
+The configuration file `test/config.yaml` defines various "structural" checks to perform on the docker image created by `../Dockerfile`.
+
+The test require the use of the [container-structure-test](https://github.com/GoogleContainerTools/container-structure-test) from Google.
+
+Follow their documentation to install.
+
+## Usage
+Generate your docker image using your preferred method e.g.
+```shell
+docker build -t api .
+```
+
+To run the tests against the image, run the following:
+```shell
+container-structure-test test --image api --config tests/config.yaml
+```

tests/config.yaml

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+schemaVersion: 2.0.0
+
+commandTests:
+  - name: check psql is installed
+    command: psql
+    args: ["--version"]
+    exitCode: 0
+  - name: check django is installed
+    command: pip
+    args: ["show", "-q", "Django"]
+    exitCode: 0
+  - name: check djangorestframework is installed
+    command: pip
+    args: ["show", "-q", "djangorestframework"]
+    exitCode: 0
+  - name: check psycopg2 is installed
+    command: pip
+    args: ["show", "-q", "psycopg2"]
+    exitCode: 0
+  - name: check Pillow is installed
+    command: pip
+    args: ["show", "-q", "Pillow"]
+    exitCode: 0
+  - name: check uwsgi is installed
+    command: pip
+    args: ["show", "-q", "uwsgi"]
+    exitCode: 0
+  - name: check flake8 is installed
+    command: pip
+    args: ["show", "-q", "flake8"]
+    exitCode: 0
+
+fileExistenceTests:
+  - name: entrypoint
+    path: /scripts/entrypoint.sh
+    shouldExist: true
+    permissions: "-rwxr-xr-x"
+  - name: requirements
+    path: /requirements.txt
+    shouldExist: true
+    permissions: "-rw-r--r--"
+  - name: /vol/web/media
+    path: /vol/web/media
+    shouldExist: true
+    permissions: "drwxr-xr-x"
+  - name: /vol/web/static
+    path: /vol/web/static
+    shouldExist: true
+    permissions: "drwxr-xr-x"