fix docker build for Linux/amd64

Author: popduke

Dockerfile

@@ -6,7 +6,7 @@ ARG TARGETPLATFORM
 
 # Install necessary tools for diagnostics and JDK download
 RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates curl net-tools lsof netcat procps less \
-    && if [[ "$TARGETPLATFORM" == *amd* ]]; then \
+    && if [ "$TARGETPLATFORM" = "linux/amd64" ]; then \
         export JDK_ARCH=x64; \
     else \
         export JDK_ARCH=aarch64; \