feat(ci): add Docker image build and release workflow

* Implement GitHub Actions workflow for Docker image build and release
* Validate release tags and manage Docker login credentials
* Build and push Docker images with versioning and metadata
* Add docker-build target to Makefile for local image building

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all build clean test test-all test-integration-go test-unit-go test-connection schema-install broker-start broker-stop install deps docker-up docker-down help
+.PHONY: all build clean test test-all test-integration-go test-unit-go test-connection schema-install broker-start broker-stop install deps docker-up docker-down docker-build release help
 
 # Build variables
 BINARY_NAME=pgsql-broker
@@ -32,7 +32,7 @@ COMPOSE_CMD := $(shell \
 
 # Version information
 VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
-BUILD_TIME=$(shell date -u '+2026-01-02_19:58:30')
+BUILD_TIME=$(shell date -u '+%Y-%m-%d_%H:%M:%S')
 COMMIT=$(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
 
 # Inject version info
@@ -73,14 +73,22 @@ schema-install: build ## Install database schema using the broker CLI
 	@echo "Installing database schema..."
 	@$(BIN_DIR)/$(BINARY_NAME) install --config broker.test.yaml
 
-test-setup: build ## Start test environment (docker-compose)
-	@echo "Starting test environment..."
-	@podman-compose -f tests/docker-compose.yml up -d
+test-setup: build ## Start test environment (docker-compose/podman-compose)
+	@echo "Starting test environment (using $(COMPOSE_CMD))..."
+	@if [ "$(CONTAINER_RUNTIME)" = "none" ]; then \
+		echo "Error: Neither Docker nor Podman is installed"; \
+		exit 1; \
+	fi
+	@$(COMPOSE_CMD) -f tests/docker-compose.yml up -d
 
-test-teardown: ## Stop test environment (docker-compose)
-	@echo "Stopping test environment..."
-	@podman-compose -f tests/docker-compose.yml down -v --rmi all
-	@sleep 5 # Give Docker time to release resources
+test-teardown: ## Stop test environment (docker-compose/podman-compose)
+	@echo "Stopping test environment (using $(COMPOSE_CMD))..."
+	@if [ "$(CONTAINER_RUNTIME)" = "none" ]; then \
+		echo "Neither Docker nor Podman is installed, skipping teardown"; \
+	else \
+		$(COMPOSE_CMD) -f tests/docker-compose.yml down -v --rmi all || true; \
+	fi
+	@sleep 5 # Give the container runtime time to release resources
 
 broker-start: build ## Start the broker in the background
 	@echo "Starting broker..."
@@ -172,6 +180,15 @@ docker-down: ## Stop PostgreSQL test database
 	fi
 	@echo "PostgreSQL stopped"
 
+docker-build: ## Build the pgsql-broker runtime image
+	@if [ "$(CONTAINER_RUNTIME)" = "none" ]; then echo "Error: Neither Docker nor Podman is installed"; exit 1; fi
+	@$(CONTAINER_RUNTIME) build \
+		--build-arg VERSION=$(VERSION) \
+		--build-arg COMMIT=$(COMMIT) \
+		--build-arg BUILD_TIME=$(BUILD_TIME) \
+		-t pgsql-broker:$(VERSION) -t pgsql-broker:latest \
+		-f Dockerfile .
+
 release: ## Create and push a new release tag (auto-increments patch version)
 	@echo "Creating new release..."
 	@latest_tag=$$(git describe --tags --abbrev=0 2>/dev/null || echo ""); \