chore: pass git creds into docker build

Dockerfile

@@ -5,6 +5,15 @@ FROM golang:1.22-alpine AS builder
 ENV SERVER_DIR=/openim-server
 ENV GOWORK=off
 
+# Credentials for private module access (optional)
+ARG GIT_USER
+ARG GIT_TOKEN
+ARG REGISTRY_USER
+ARG REGISTRY_PASSWORD
+
+ENV GOPRIVATE=git.imall.cloud
+ENV GONOSUMDB=git.imall.cloud
+
 # Set the working directory inside the container based on the environment variable
 WORKDIR $SERVER_DIR
 
@@ -17,6 +26,13 @@ RUN apk add --no-cache git
 # Copy all files from the current directory into the container
 COPY . .
 
+RUN set -eu; \
+	user="${GIT_USER:-$REGISTRY_USER}"; \
+	token="${GIT_TOKEN:-$REGISTRY_PASSWORD}"; \
+	if [ -n "$user" ] && [ -n "$token" ]; then \
+		git config --global url."https://${user}:${token}@git.imall.cloud/".insteadOf "https://git.imall.cloud/"; \
+	fi
+
 RUN go mod download
 
 # Install Mage to use for building the application