Fix deploy: force Docker rebuild, add version check and redeploy script

Dockerfile

@@ -9,7 +9,11 @@ COPY go.mod go.sum ./
 RUN go mod download
 
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /shop ./cmd/shop
+ARG APP_VERSION=dev
+ARG BUILD_TIME=unknown
+RUN CGO_ENABLED=0 GOOS=linux go build \
+    -ldflags="-s -w -X shop/internal/version.Version=${APP_VERSION}" \
+    -o /shop ./cmd/shop
 
 # Runtime stage
 FROM alpine:3.21