fix(scripts): add missing build-docker-express.sh script

Ticket: BTC-2566

- Re-added back docker file script that was missing for some reason

Author: andyyan162

scripts/build-docker-express.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -e
+
+# Get dynamic build arguments
+BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+VERSION=$(jq -r .version < modules/express/package.json)
+GIT_HASH=$(git rev-parse HEAD)
+
+echo "Building Docker image with:"
+echo "  BUILD_DATE: $BUILD_DATE"
+echo "  VERSION: $VERSION"
+echo "  GIT_HASH: $GIT_HASH"
+
+# Build the Docker image
+docker build \
+  --platform=linux/amd64 \
+  --build-arg BUILD_DATE="$BUILD_DATE" \
+  --build-arg VERSION="$VERSION" \
+  --build-arg GIT_HASH="$GIT_HASH" \
+  -t bitgo/express:latest \
+  -t bitgo/express:"$VERSION" \
+  .
+
+echo "Docker build completed successfully!"