feat: Implement enterprise-grade Kubernetes deployment with Helm charts

.github/services-to-build.txt

@@ -3,6 +3,7 @@
 # Comments (lines starting with #) and empty lines are ignored
 
 # Core Application Services
+frontend
 chat_service
 embedder_service
 pdf_processor_service

.github/workflows/helm.yml

@@ -25,6 +25,17 @@ jobs:
       - name: Lint all Helm charts in ./helm/
         run: |
           for chart in helm/*/; do
-            echo "Linting chart: $chart"
-            helm lint "$chart" || exit 1
+            # Skip directories that aren't Helm charts
+            if [[ "$chart" == "helm/assets/" || "$chart" == "helm/shared-values/" ]]; then
+              echo "Skipping non-chart directory: $chart"
+              continue
+            fi
+
+            # Only lint if Chart.yaml exists
+            if [[ -f "$chart/Chart.yaml" ]]; then
+              echo "Linting chart: $chart"
+              helm lint "$chart" || exit 1
+            else
+              echo "Skipping directory without Chart.yaml: $chart"
+            fi
           done

.gitignore

@@ -56,3 +56,6 @@ coverage/
 # Code assist tools
 .claude/
 CLAUDE.md
+
+# Istio installation directory (downloaded binaries)
+istio-*/

Makefile

@@ -0,0 +1,171 @@
+# Makefile for Helm chart management in OmniPDF
+
+# Default namespace and configurable chart
+NAMESPACE ?= omnipdf
+CHART_NAME ?= example-service
+CHART_DIR ?= helm/$(CHART_NAME)
+ENV ?= staging
+
+# Service-specific values files (environment-specific only)
+SERVICE_ENV_VALUES_FILE ?= $(CHART_DIR)/values-$(ENV).yaml
+SERVICE_BASE_VALUES_FILE ?= $(CHART_DIR)/values.yaml
+
+# Build values file list (prioritize environment-specific, fallback to base for rbac)
+ifneq ($(wildcard $(SERVICE_ENV_VALUES_FILE)),)
+    VALUES_FILES = -f $(SERVICE_ENV_VALUES_FILE)
+else ifneq ($(wildcard $(SERVICE_BASE_VALUES_FILE)),)
+    VALUES_FILES = -f $(SERVICE_BASE_VALUES_FILE)
+else
+    $(error No values file found for $(CHART_NAME). Expected: $(SERVICE_ENV_VALUES_FILE) or $(SERVICE_BASE_VALUES_FILE))
+endif
+
+# Default port for port-forwarding (override as needed)
+LOCAL_PORT ?= 8000
+REMOTE_PORT ?= 8000
+
+.PHONY: help install install-all upgrade upgrade-all uninstall uninstall-all lint status port-forward
+
+help:
+	@echo "Makefile commands for Helm chart management:"
+	@echo ""
+	@echo "Single-service commands:"
+	@echo "  make install                Install chart (CHART_NAME, ENV)"
+	@echo "                              e.g. make install CHART_NAME=chat-service ENV=staging"
+	@echo "  make upgrade                Upgrade chart (CHART_NAME, ENV)"
+	@echo "                              e.g. make upgrade CHART_NAME=embedder-service ENV=prod"
+	@echo "  make uninstall              Uninstall chart (CHART_NAME)"
+	@echo "                              e.g. make uninstall CHART_NAME=pdf-processor"
+	@echo "  make lint                   Run helm lint on chart (CHART_NAME)"
+	@echo "                              e.g. make lint CHART_NAME=embedder-service"
+	@echo "  make lint-all               Lint all charts under ./helm/"
+	@echo "  make status                 Show status of Helm release (CHART_NAME)"
+	@echo "                              e.g. make status CHART_NAME=chat-service"
+	@echo "  make port-forward           Port-forward a pod to local machine"
+	@echo "                              e.g. make port-forward CHART_NAME=chat-service LOCAL_PORT=8000 REMOTE_PORT=8000"
+	@echo ""
+	@echo "Multi-service commands:"
+	@echo "  make install-all            Install all charts (ENV)"
+	@echo "                              e.g. make install-all ENV=prod"
+	@echo "  make upgrade-all            Upgrade all charts (ENV)"
+	@echo "                              e.g. make upgrade-all ENV=staging"
+	@echo "  make uninstall-all          Uninstall all charts under ./helm/"
+	@echo ""
+	@echo "Values System:"
+	@echo "  Uses explicit environment-specific files only:"
+	@echo "  1. helm/{SERVICE}/values-{ENV}.yaml         - Environment-specific configuration"
+	@echo "  2. helm/{SERVICE}/values.yaml               - Fallback for rbac only"
+	@echo ""
+	@echo "Environment Variables:"
+	@echo "  ENV                         Environment (staging, prestaging, prod) - defaults to 'staging'"
+	@echo ""
+	@echo "Development Environment:"
+	@echo "  Use docker-compose for local development:"
+	@echo "    docker-compose up -d                           # Start all services locally"
+	@echo "    docker-compose logs -f chat_service            # View service logs"
+	@echo ""
+	@echo "⚠️ IMPORTANT:"
+	@echo "  Avoid underscores (_) in CHART_NAME or release names."
+	@echo "  Use hyphens (-) instead to follow Kubernetes naming conventions (RFC 1123)."
+	@echo "  Example: use chat-service ✅, not chat_service ❌"
+
+## Install a single Helm chart
+install:
+	@echo "Installing $(CHART_NAME) for environment: $(ENV)"
+	@echo "Values files (in order): $(VALUES_FILES)"
+	helm upgrade --install $(CHART_NAME) $(CHART_DIR) \
+		--namespace $(NAMESPACE) \
+		--create-namespace \
+		$(VALUES_FILES)
+
+## Upgrade a single Helm chart
+upgrade:
+	@echo "Upgrading $(CHART_NAME) for environment: $(ENV)"
+	@echo "Values files (in order): $(VALUES_FILES)"
+	helm upgrade $(CHART_NAME) $(CHART_DIR) \
+		--namespace $(NAMESPACE) \
+		$(VALUES_FILES)
+
+## Uninstall a single Helm chart
+uninstall:
+	helm uninstall $(CHART_NAME) \
+		--namespace $(NAMESPACE)
+
+## Lint all Helm charts under ./helm/
+lint-all:
+	@echo "Linting all Helm charts under ./helm/..."
+	@for dir in helm/*/; do \
+		CHART=$$(basename $$dir); \
+		if [ "$$CHART" != "shared-values" ] && [ "$$CHART" != "assets" ]; then \
+			echo "Linting chart: $$CHART"; \
+			helm lint $$dir || exit 1; \
+		else \
+			echo "Skipping non-chart directory: $$dir"; \
+		fi; \
+	done
+
+## Run lint check on a chart
+lint:
+	helm lint $(CHART_DIR)
+
+## Show release status and pod info
+status:
+	@echo "=== Helm Release Status ==="
+	helm status $(CHART_NAME) -n $(NAMESPACE)
+	@echo ""
+	@echo "=== Pod Status ==="
+	kubectl get pods -n $(NAMESPACE) -l "app.kubernetes.io/name=$(CHART_NAME),app.kubernetes.io/instance=$(CHART_NAME)"
+
+# Helper function to deploy all charts (used by both install-all and upgrade-all)
+define deploy-all-charts
+	@echo "$(1) all Helm charts under ./helm/ for environment: $(ENV)"
+	@for dir in helm/*/; do \
+		CHART=$$(basename $$dir); \
+		if [ "$$CHART" != "assets" ]; then \
+			echo "$(1) chart: $$CHART"; \
+			if [ -f "helm/$$CHART/values-$(ENV).yaml" ]; then \
+				CHART_VALUES="-f helm/$$CHART/values-$(ENV).yaml"; \
+			elif [ -f "helm/$$CHART/values.yaml" ]; then \
+				CHART_VALUES="-f helm/$$CHART/values.yaml"; \
+			else \
+				echo "Error: No values file found for $$CHART"; \
+				exit 1; \
+			fi; \
+			helm upgrade --install $$CHART helm/$$CHART \
+				--namespace $(NAMESPACE) \
+				--create-namespace \
+				$$CHART_VALUES; \
+		fi; \
+	done
+endef
+
+## Install all Helm charts in ./helm/
+install-all:
+	$(call deploy-all-charts,Installing)
+
+## Upgrade all Helm charts in ./helm/
+upgrade-all:
+	$(call deploy-all-charts,Upgrading)
+
+## Uninstall all Helm charts in ./helm/
+uninstall-all:
+	@echo "Uninstalling all Helm charts under ./helm/..."
+	@for dir in helm/*/; do \
+		CHART=$$(basename $$dir); \
+		if [ "$$CHART" != "shared-values" ] && [ "$$CHART" != "assets" ]; then \
+			echo "Uninstalling chart: $$CHART"; \
+			helm uninstall $$CHART \
+				--namespace $(NAMESPACE); \
+		fi; \
+	done
+
+## Port-forward a running pod (default 8000:8000)
+port-forward:
+ifeq ($(CHART_NAME),example-service)
+	@echo "ERROR: CHART_NAME must be specified. Example usage:"
+	@echo "  make port-forward CHART_NAME=chat-service LOCAL_PORT=3000 REMOTE_PORT=8000"
+	@exit 1
+else
+	kubectl --namespace $(NAMESPACE) port-forward \
+	  deployment/$(CHART_NAME) \
+	  $(LOCAL_PORT):$(REMOTE_PORT)
+endif