add source code and readme

manifests/applications/picsur/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: picsur
+  namespace: picsur-system
+  labels:
+    app: picsur
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: picsur
+  template:
+    metadata:
+      labels:
+        app: picsur
+    spec:
+      containers:
+      - name: picsur
+        image: ghcr.io/caramelfur/picsur:latest
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8080
+          protocol: TCP
+        env:
+        - name: PICSUR_PORT
+          value: "8080"
+        - name: PICSUR_HOST
+          value: "0.0.0.0"
+        envFrom:
+        - secretRef:
+            name: picsur-config
+        volumeMounts:
+        - name: picsur-data
+          mountPath: /app/data
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "200m"
+          limits:
+            memory: "1Gi"
+            cpu: "1000m"
+        livenessProbe:
+          httpGet:
+            path: /
+            port: 8080
+          initialDelaySeconds: 30
+          periodSeconds: 10
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /
+            port: 8080
+          initialDelaySeconds: 5
+          periodSeconds: 5
+          timeoutSeconds: 5
+          failureThreshold: 3
+        securityContext:
+          runAsNonRoot: true
+          runAsUser: 1000
+          runAsGroup: 1000
+          allowPrivilegeEscalation: false
+          readOnlyRootFilesystem: false
+          capabilities:
+            drop:
+              - ALL
+      volumes:
+      - name: picsur-data
+        persistentVolumeClaim:
+          claimName: picsur-data