Try targetplatform

Dockerfile

@@ -12,11 +12,10 @@ RUN apk update \
 
 ENV DOCKERIZE_VERSION=0.5.0
 
-RUN apkArch="$(apk --print-arch)"; \
-case "$apkArch" in \
-    armhf) export DOCKERIZE_ARCH='armhf' ;; \
-    x86) export DOCKERIZE_ARCH='amd64' ;; \
-esac;
+ARG TARGETPLATFORM
+RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then DOCKERIZE_ARCH=amd64; elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then DOCKERIZE_ARCH=armhf; else DOCKERIZE_ARCH=amd64; fi
+
+RUN "DOCKERIZE_ARCH=${DOCKERIZE_ARCH}"
 
 RUN wget -nv -O - "https://github.com/jwilder/dockerize/releases/download/v${DOCKERIZE_VERSION}/dockerize-linux-${DOCKERIZE_ARCH}-v${DOCKERIZE_VERSION}.tar.gz" | tar -xz -C /usr/local/bin/ -f -