FEAT(web-apps): enable HA with replica 2 and soft anti-affinity

- Add replicaCount: 2 to all web applications
- Add soft pod anti-affinity for node distribution
- Update chart template to handle affinity correctly
- Configure affinity for todo, portfolio, jovies, jotion, joossam, joossam-dev, jaejadle, jaejadle-dev

charts/web-app/templates/deployment.yaml

@@ -76,7 +76,20 @@ spec:
       {{- end }}
       {{- with .Values.affinity }}
       affinity:
+        {{- if and .podAntiAffinity .podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecution }}
+        podAntiAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+            {{- range .podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecution }}
+            - weight: {{ .weight }}
+              podAffinityTerm:
+                labelSelector:
+                  matchLabels:
+                    app: {{ include "web-app.fullname" $ }}
+                topologyKey: {{ .podAffinityTerm.topologyKey }}
+            {{- end }}
+        {{- else }}
         {{- toYaml . | nindent 8 }}
+        {{- end }}
       {{- end }}
       {{- with .Values.tolerations }}
       tolerations:

charts/web-app/values.yaml

@@ -15,7 +15,7 @@ imagePullSecrets:
   - name: ghcr-secret
 
 # Replicas
-replicaCount: 1
+replicaCount: 2
 
 # Container port
 containerPort: 3000
@@ -106,5 +106,10 @@ nodeSelector: {}
 # Tolerations
 tolerations: []
 
-# Affinity
-affinity: {}
+# Affinity - Soft Anti-Affinity to spread pods across nodes
+affinity:
+  podAntiAffinity:
+    preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          topologyKey: kubernetes.io/hostname