doc: Add DO diagram

.do/README.md

@@ -1,3 +1,8 @@
 # Testing Infrastructure
 
 We are using DigitalOcean to test our installation outside of AWS.
+
+## Architecture
+<img src="doc/diagrams/out/do.jpg" width="60%" height="60%">
+
+Information on how to generate diagrams [here](https://codacy.slite.com/app/docs/AeaKyDY7-G1HG0).

.do/doc/diagrams/Makefile

@@ -0,0 +1,18 @@
+PYTHON=python3
+
+help:
+	@echo "Usage:"
+	@echo "    help          show this message"
+	@echo "    setup         create virtual environment and install dependencies"
+	@echo "    diagrams      generates diagrams for all configurations stored in /src to /out"
+
+setup:
+	$(PYTHON) -m pip install diagrams --upgrade
+	@echo "Setup concluded"
+
+diagrams:
+	@for f in src/*.py; do $(PYTHON) $$f; done
+	@echo "Diagrams successfully generated"
+
+.PHONY: help setup diagrams
+

.do/doc/diagrams/src/do.py

@@ -0,0 +1,38 @@
+from os.path import dirname, abspath
+from diagrams import Diagram, Cluster
+from diagrams.k8s.group import NS
+from diagrams.digitalocean.network import Firewall
+from diagrams.digitalocean.database import DbaasPrimary
+from diagrams.digitalocean.compute import K8SCluster, K8SNodePool
+
+file_dir = dirname(abspath(__file__))
+
+with Diagram(
+    name="Digital Ocean K8s Cluster",
+    show=False,
+    direction="LR",
+    curvestyle="ortho",
+    outformat=["jpg"],
+    filename=dirname(file_dir) + "/out/" + "do",
+    graph_attr={"pad": "0.2",},
+):
+
+    with Cluster("Digital Ocean"):
+
+        with Cluster("k8s_cluster"):
+            cluster = K8SCluster("k8s_cluster")
+            node_pools = cluster - [
+                K8SNodePool("default_node_pool"),
+                K8SNodePool("auto_scale_pool"),
+            ]
+
+            with Cluster("namespaces"):
+                namespaces = cluster - [
+                    NS("codacy_dev"),
+                    NS("codacy_sandbox"),
+                    NS("codacy_release"),
+                ]
+
+        with Cluster("database_cluster"):
+            node_pools - Firewall("postgres_fw") - DbaasPrimary("postgres_db")
+