WIP: new arg that allows us to specify a build platform

Author: marc-casavant

src/tests/multi-server/scripts/build_image.sh

@@ -1,2 +1,11 @@
 #!/bin/bash
-docker build -f src/tests/multi-server/builds/Dockerfile.multi-server-prof -t freeradius-prof:latest .
+PLATFORM_ARG=""
+
+# This allows us to build an image on Apple Silicon where the base image was built on an linux/amd64 platform.
+if [ "${BUILD_PLATFORM}" = "amd64" ]; then
+    PLATFORM_ARG="--platform=linux/amd64"
+elif [ -n "${BUILD_PLATFORM}" ]; then
+    PLATFORM_ARG="--platform=linux/${BUILD_PLATFORM}"
+fi
+
+docker build ${PLATFORM_ARG} -f src/tests/multi-server/builds/Dockerfile.multi-server-prof -t freeradius-prof:latest .