feat(postgres): add shared database deployments

postgres/k8s/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: database
+  labels:
+    app.kubernetes.io/part-of: homelab-database

postgres/k8s/network-policy.yaml

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+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: postgres-ingress
+  namespace: database
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: postgres
+  policyTypes:
+    - Ingress
+  ingress:
+    - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: authentik
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: gitea
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: netronome
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: penpot
+      ports:
+        - protocol: TCP
+          port: 5432

postgres/k8s/postgres.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  namespace: database
+  labels:
+    app.kubernetes.io/name: postgres
+    app.kubernetes.io/part-of: homelab-database
+spec:
+  selector:
+    app.kubernetes.io/name: postgres
+  ports:
+    - name: postgres
+      port: 5432
+      targetPort: postgres
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: postgres
+  namespace: database
+spec:
+  serviceName: postgres
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: postgres
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: postgres:15.19-alpine
+          ports:
+            - name: postgres
+              containerPort: 5432
+          env:
+            - name: POSTGRES_DB
+              value: postgres
+            - name: POSTGRES_USER
+              value: postgres
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-shared-secrets
+                  key: POSTGRES_ADMIN_PASSWORD
+          envFrom:
+            - secretRef:
+                name: postgres-shared-secrets
+          volumeMounts:
+            - name: postgres-data
+              mountPath: /var/lib/postgresql/data
+            - name: initdb
+              mountPath: /docker-entrypoint-initdb.d/01-create-databases.sh
+              subPath: 01-create-databases.sh
+          readinessProbe:
+            exec:
+              command: ["pg_isready", "-U", "postgres", "-d", "postgres"]
+            initialDelaySeconds: 10
+            periodSeconds: 10
+          livenessProbe:
+            exec:
+              command: ["pg_isready", "-U", "postgres", "-d", "postgres"]
+            initialDelaySeconds: 30
+            periodSeconds: 20
+      volumes:
+        - name: initdb
+          configMap:
+            name: postgres-initdb
+            defaultMode: 0755
+  volumeClaimTemplates:
+    - metadata:
+        name: postgres-data
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 20Gi
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: postgres-initdb
+  namespace: database
+data:
+  01-create-databases.sh: |
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    : "${AUTHENTIK_DB_PASSWORD:?AUTHENTIK_DB_PASSWORD is required}"
+    : "${GITEA_DB_PASSWORD:?GITEA_DB_PASSWORD is required}"
+    : "${NETRONOME_DB_PASSWORD:?NETRONOME_DB_PASSWORD is required}"
+    : "${PENPOT_DB_PASSWORD:?PENPOT_DB_PASSWORD is required}"
+
+    create_role_and_database() {
+      local role="$1"
+      local database="$2"
+      local password="$3"
+      psql --username "$POSTGRES_USER" --dbname postgres \
+        -v role="$role" -v database="$database" -v password="$password" \
+        <<'SQL'
+    SELECT format('CREATE ROLE %I LOGIN PASSWORD %L', :'role', :'password')
+    WHERE NOT EXISTS (SELECT FROM pg_roles WHERE rolname = :'role')\gexec
+    SELECT format('CREATE DATABASE %I OWNER %I', :'database', :'role')
+    WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = :'database')\gexec
+    SQL
+    }
+
+    create_role_and_database authentik authentik "$AUTHENTIK_DB_PASSWORD"
+    create_role_and_database gitea gitea "$GITEA_DB_PASSWORD"
+    create_role_and_database netronome netronome "$NETRONOME_DB_PASSWORD"
+    create_role_and_database penpot penpot "$PENPOT_DB_PASSWORD"

postgres/k8s/secrets.yaml.example

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: postgres-shared-secrets
+  namespace: database
+type: Opaque
+stringData:
+  POSTGRES_ADMIN_PASSWORD: ""
+  AUTHENTIK_DB_PASSWORD: ""
+  GITEA_DB_PASSWORD: ""
+  NETRONOME_DB_PASSWORD: ""
+  PENPOT_DB_PASSWORD: ""