[fix builds on arm] [fix boost builds]

docker/x86_64/alpine

@@ -1,5 +1,5 @@
 #comment
-FROM         alpine:3.23
+FROM         --platform=linux/amd64 alpine:3.23
 MAINTAINER   Scott E. Graves <scott.e.graves@protonmail.com>
 CMD          bash
 

docker/x86_64/mingw64

@@ -1,5 +1,5 @@
 #comment
-FROM alpine:3.23
+FROM --platform=linux/amd64 alpine:3.23
 
 RUN apk update
 RUN apk upgrade